Question

39) A train running with the speed of 54
km/hr can cross an electronic pole in
40 sec. if the train increases its speed
by 20% the in how much time it can
cross a 750 m. long platform
a) 120 sec c) 84 sec
b) 75 sec
d) 90 sec​

Answer 1

Answer:

Question : A train running at a speed of 54 km per hour passes an electric pole in 11 seconds. How long will it take to cross a platform 240 metre long?

Answer : 54km/h = 54000/3600 m/s = 15m/s

Time to cross pole =11 s

Hence length of train = v×t = 15× 11= 165 m

Time taken to cross platform = ( Length of platform+ length of train)/v = 165+240)/15 = 405/15 = 27 Second.

Step-by-step explanation:

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