Question

what is the time taken by a 750m long train travelling at 99 km/hour to cross a boy running at 9km/hr towards the train?

Answer 1

Answer:

25 second

Step-by-step explanation:

1st we have to plus the speed = 99 + 9

=108km/hr

If a train can travel 108 km in 1hr

(108km=108000 meter) (1hr = 3600 second)

So in which time it can travel 750 meter =

108000/3600×750/x. (x= time taken )

25 seconds

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Answer 2

Answer:

Step-by-step explanation:

Here, two things are mentioned in this question.

1) TRAIN                                                            2)BOY

GIVEN:                                                             GIVEN:

Distance= 750m                                   Speed of a boy=9km/hr

Speed of train= 99km/hr                                

                          Time Taken = ?

                    1)Add two speeds [ 99+9=108km/hr]

  Given distance is in metre.So, we have to convert the speed from km/hr to m/s.

 For Conversion,

                        108*5/18=30m/s.

Now, the Speed is 30m/s and the given distance is 750m.So the time taken is,

                Speed=Distance/Time=====> Time=Distance/Speed

                                                                           =750/30

                                                                  Time=25s