a river 4 m deep and 40 m wide is flowing at the rate of 4 kmph the amount of water that runs into the sea per minute is ?
"( 4000 * 4 * 40 ) / 60 = 10666 m 3 answer : a"
divide(multiply(multiply(4, 40), multiply(4, const_1000)), multiply(const_1, const_60))