Question 129

A 210 metre long train crosses a man running at 9 kmph in opposite direction in 6 seconds. Find the speed of the train.

Solution

let the speed of train be a km/hr

As both man and train are moving towards each other and hence the relative speed will be (a+9) km/hr = (a + 9) x $$\frac{5}{18}$$

Length of Train = 210 m

Time taken = 6 sec

using Distance = Speed x Time

210 = (a + 9) x $$\frac{5}{18}$$ x 6

a = (126 - 9) = 117 km/hr

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