how long will a boy take to run round a square field of side 20 meters , if he runs at the rate of 12 km / hr ?
"speed = 12 km / hr = 12 * 5 / 18 = 10 / 3 m / sec distance = 20 * 4 = 80 m time taken = 80 * 3 / 10 = 24 sec answer is d"
divide(multiply(20, const_4), multiply(12, divide(const_1000, const_3600)))