a boat covers a certain distance downstream in 1 hour , while it comes back in 11 â  „ 2 hours . if the speed of the stream be 3 kmph , what is the speed of the boat in still water ?
"let the speed of the water in still water = x given that speed of the stream = 3 kmph speed downstream = ( x + 3 ) kmph speed upstream = ( x â ˆ ’ 3 ) kmph he travels a certain distance downstream in 1 hour and come back in 11 â  „ 2 hour . i . e . , distance travelled downstream in 1 hour = distance travelled upstream in 11 â  „ 2 hour since distance = speed ã — time , we have ( x + 3 ) ã — 1 = ( x - 3 ) 3 / 2 2 ( x + 3 ) = 3 ( x - 3 ) 2 x + 6 = 3 x - 9 x = 6 + 9 = 15 kmph answer : d"
divide(add(multiply(divide(const_3, const_2), const_3.0), 2), subtract(divide(const_3, const_2), 1))