a man swims downstream 96 km and upstream 40 km taking 8 hours each time ; what is the speed of the current ?
"explanation : 96 - - - 8 ds = 12 ? - - - - 1 40 - - - - 8 us = 5 ? - - - - 1 s = ? s = ( 12 - 5 ) / 2 = 3.5 answer : option a"
divide(add(divide(40, 8), divide(96, 8)), const_2)