Question 63

Two trains 100 m and 80 m in length are moving in the same direction, with speeds 51 m/s and 42 m/s respectively. In what time will they cross each other?

Solution

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speed = $$51 m/s - 42 m/s = 9 m/s$$

speed = $$\frac{length of train1 + length of train2}{time}$$

9 = $$\frac{100 + 80}{time}$$

time = $$\frac{120}{9}$$ 

        20 seconds

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