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

ReplyDeletex = total distance in miles

ReplyDeletetime 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

Dude ur doomed just skip a day

Delete45 miles per hour

ReplyDeleteTrain is on the move....

ReplyDelete6.75x10^8 m.p.h

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

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

Delete45mph 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.

DeleteDrive 60 mph

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

ReplyDeletereach the next station before the train.

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

ReplyDelete45 MILES/HR

ReplyDeletehey buddy wait for the next train

ReplyDeleteyou have to teleport

ReplyDeleteyou have to teleport

ReplyDeleteIt 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!!!

ReplyDeleteExactly

DeleteIt does say how long he waits, arrives just in time to catch the train

Deleteyou can always cath ch the train at the next stop

ReplyDeleteu catch the next bus :)

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

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

ReplyDeletedue to traffic ,the train was also late so,no problem

ReplyDeletehey 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!

ReplyDelete2519..................

Delete(2x3x4x5x6x7x8x9)=2520

but we hav to do -1 because we need the required remainder.....

so the answer is 2519

Let the number be K

DeleteAs 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

let total distance be = x

ReplyDeleteso 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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ReplyDeleteThese are two simple questions which are often asked in interviews. Try solving them.

ReplyDelete1. 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?

1. answer 3

Delete2. answer: 4

THREE

Deletesame speed

ReplyDeletesame speed

ReplyDeletetell the train driver that a bomb is on ur train.

ReplyDelete45 mile

ReplyDelete60 mile 3*20

ReplyDelete