Question 72

A train crossed a 140 m long platform in 15 seconds and a 180 m long platform in 17
seconds. The speed of the train was:

Solution

Difference in lengths of platforms

= 180 - 140 = 40m

Difference in time taken to cross them

= 17 - 15 = 2 s

=> Speed of train = $$\frac{distance}{time}$$

$$\frac{40}{2}$$ = 20 $$\frac{m}{s}$$

= $$20\times \frac{18}{5}$$= 72 kmph

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A train crossed a 140 m long platform in 15 seconds and a 180 m long platform in 17seconds. The speed of the train was: