## How many minutes does Ashok take to cover a distance of 400 meters if he runs at a speed of 20 km/hr ?

Ashok’s speed = 20 km/hr = $(20\times \frac{5}{18})$m/sec $=$ $(\frac{50}{9})$ m/sec

Time taken to cover 400 meters = $(400\times \frac{9}{50})$sec

= 72 sec

= 1$\frac{1}{5}$ minutes