Q. A man walks 'a' km in 'b' hours. The time taken to walk 200 meters is :
Answer: $latex \frac{b}{5a}hours&s=1$
Notes: Man's Speed $latex = \frac{Distance}{Time}&s=1$ $latex = \frac{a}{b}km/hr&s=1$ $latex = \frac{1000a}{b}m/hr&s=1$ ∴ Time taken in walking 200 metre $latex = \frac{200}{\frac{1000a}{b}} = \frac{b}{5a}hours&s=1$ Hence option [B] is correct answer.

4