Question 30

In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar

Solution

Speed of train = 50 km/hr

= $$(50 \times \frac{5}{18})$$ m/s = $$\frac{125}{9}$$ m/s

Length of train = 100 m

Using, time = distance/speed

=> Time taken = $$100\div \frac{125}{9}$$

= $$100 \times \frac{9}{125}$$

= $$\frac{36}{5}=7.2$$ sec

=> Ans - (C)

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