if a boat goes 7 km upstream in 42 minutes and the speed of the stream is 6 kmph , then the speed of the boat in still water is
explanation : rate upstream = ( 7 / 42 ) * 60 kmh = 10 kmph . speed of stream = 6 kmph . let speed in still water is x km / hr then , speed upstream = ( x ï ¿ ½ 6 ) km / hr . x - 6 = 10 or x = 16 kmph answer : e
subtract(divide(7, divide(42, const_60)), 6)