a man swims downstream 24 km and upstream 16 km taking 4 hours each time , what is the speed of the man in still water ?
"24 - - - 4 ds = 6 ? - - - - 1 16 - - - - 4 us = 4 ? - - - - 1 m = ? m = ( 6 + 4 ) / 2 = 5 answer : b"
divide(add(divide(16, 4), divide(24, 4)), const_2)