a man swims downstream 32 km and upstream 24 km taking 4 hours each time , what is the speed of the man in still water ?
"32 - - - 4 ds = 8 ? - - - - 1 24 - - - - 4 us = 6 ? - - - - 1 m = ? m = ( 8 + 6 ) / 2 = 7 answer : d"
divide(add(divide(24, 4), divide(32, 4)), const_2)