Question

A train crosses a man going along a railway track at 6km/hr who could see the train upto 2 minutes. Find the speed of the train in km/hr, if at the time of disappearance

Answer 1

39km/hr........................................refer to attachment for complete explaination

Answer 2

Given : A train crosses a man going along the railway track at 6km/hr. The man could see the train upto 2minute.  At the time of disapperance the distance between train to man was 1.2 km while length of the train is 300meter.​

To Find :  Speed of the train

Solution:

Person will start seeing train when engine comes in in front oh him  and at end he sees back of train

so relative distance traveled by train = Distance at time of disappearance + train length  = 1.2 km + 300 m  = 1500 m  

As man was also going in same direction hence actual distance travelled by train = 1500 m + Distance traveled by man in 2 minutes

Distance traveled by man in 2 minutes  = 6  * 2/60  = 0.2 km = 200 m

Distance traveled by train =  1500 + 200 = 1700 m  = 1.7 km

Time = 2 minutes   =  1/30 hr

Speed of Train = 1.7/1/(30)  = 51 km/hr

Speed of Train = 51 km/hr

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