Trains Boats and Streams Practice Test 4 with solutions

Let the speed of motor boat in the still water = x
Speed downstream = x + 6
Speed upstream = x - 6
Distance covered in both ways is equal so,
(x + 6) 6 = (x - 6) 8
6x + 36 = 8x - 48
2x = 84
x = 42 km/hour
So, speed of the motor boat in the still water = 42 km/hour