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Tricky Maths Problem

catch a TrainTricky Maths Problem - 30 July

I drive at an average speed of 30 miles per hour to the railroad station each morning and just catch my train. On a particular morning there was a lot of traffic and at the halfway point I found I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?

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38 comments:

  1. The train is just about to leave the station and there is no way I will be able to catch it this time.

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  2. x = total distance in miles

    time taken in normal day = x/30 hr

    -----

    traveling x/2 miles distance at 15 miles/hr will take time = x/30 hr

    Ans : you will miss the train

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    Replies
    1. Dude ur doomed just skip a day

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  3. 45 miles per hour

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  4. 6.75x10^8 m.p.h
    If he drive 6.75x10^8 m.p.h, he will not miss the train.

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    1. This comment has been removed by the author.

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    2. Thats pretty fast. But youre right they didnt say youre care wasnt a super awsome secret agent car

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    3. 45mph because since you were going half of the original speed, you now needed to go 1 1/2 times as fast as the original speed to make it there on time.

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  5. there is only and only one way to catch the train go with speed of light,,,,,,and thats impossible

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  6. reach the next station before the train.

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  7. you are going on pathetic speed :eek just 30miles/hour. Sell ur old scooter buy haya bussa

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  8. 45 MILES/HR

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  9. hey buddy wait for the next train

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  10. It does not say how long does he wait after he has reached the train station so he has to teleport for a safe result. If he could travel at the speed of light he would not need a train. Think about that!!!

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    Replies
    1. It does say how long he waits, arrives just in time to catch the train

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  11. you can always cath ch the train at the next stop

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  12. u catch the next bus :)

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  13. dude why to run an ol scooter or train when you can go through bus. think this way

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  14. it was sunday- a holiday ,then why to go for job.......

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  15. due to traffic ,the train was also late so,no problem

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  16. hey guys! can you help me? I have a word problem that says this. 'There is a remainder less than 3000 that when divided by 2 leaves a remainder of 1, when divided by 3 leaves a remainder of 2 when divided by 4 leaves a remainder of 3 and so on until 9. What is the number?' pls help tonight!

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    Replies
    1. 2519..................
      (2x3x4x5x6x7x8x9)=2520
      but we hav to do -1 because we need the required remainder.....
      so the answer is 2519

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    2. Let the number be K

      As per the statement K is of the form: (x,y,z,a,b,c,d are arbitrary natural numbers)

      K = 2x + 1;
      K = 3y + 2;
      k = 4z + 3;
      k = 5a + 4;
      K = 6b + 5;
      k = 7b + 6;
      k = 8c + 7;
      k = 9d + 8;

      the above statement can also be written as:

      K = 2(x+1) - 1;
      K = 3(y+1) - 1;
      k = 4(z+1) - 1;
      k = 5(a+1) - 1;
      K = 6(b+1) - 1;
      k = 7(b+1) - 1;
      k = 8(c+1) - 1;
      k = 9(d+1) - 1;

      In other words K is 1 less then the LCM of 2,3,4,5,6,7,8,9

      LCM of 2,3,4,5,6,7,8,9: 2x3x4x5x6x7x8x9 = 2520

      So the answer is
      k = LCM of 2,3,4,5,6,7,8,9 - 1
      = 2520 - 1 = 2519

      Delete
  17. let total distance be = x
    so time taken every day is = x/30
    or train leaves the station after x/30 time.
    (assuming average speed of 30MPH )

    on this fateful day you realised after traveling half way(x/2 distance) that u were traveling at 15MPH and hence time u have already taken is (x/2)/15 = x/30..


    ohh my god..... ur train has just left..... now u better go back home and ask for the day off......

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  18. This comment has been removed by the author.

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  19. These are two simple questions which are often asked in interviews. Try solving them.

    1. If you have seven white socks and nine black socks in a drawer, how many socks do you have to pull out blindly in order to ensure that you have a matching pair?

    2. If I give you a traditional two-sided scale along with nine, similarly-sized balls—eight of which are of equal weight, one of which weighs less than the rest—how many times do you need to weigh the balls to determine which is the lighter one?

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  20. tell the train driver that a bomb is on ur train.

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