the speed of a boat in still water in 30 km / hr and the rate of current is 7 km / hr . the distance travelled downstream in 36 minutes is :
"explanation : speed downstream = ( 30 + 7 ) = 37 kmph time = 36 minutes = 36 / 60 hour = 3 / 5 hour distance travelled = time × speed = ( 3 / 5 ) × 37 = 22.2 km answer : option e"
multiply(add(30, 7), divide(36, const_60))