Question 52

A 900 metre long train crosses a 1200 metres long platform completely in 70 seconds. What is the speed of the train?

Solution

A 900 metre long train crosses a 1200 metres long platform completely in 70 seconds.

Speed of the train = $$\frac{length\ of\ train+length\ of\ platform}{time}$$

= $$\frac{900+1200}{70}$$

= $$\frac{2100}{70}$$

= 30 m/s

Here we need the speed in km/h. We know that 1 km = 1000 m and 1 hour = 3600 seconds.

Speed of the train = $$30\times\frac{3600}{1000}$$ km/h

= $$3\times36$$ km/h

= 108 km/h

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