The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is ?
Speed of the stream = 1 Motor boat speed in still water be = x kmph Down Stream = x + 1 kmph Up Stream = x - 1 kmph [35/(x + 1)] + [35/(x - 1)] = 12 x = 6 kmph
We have: (l - b) = 23 and 2(l + b) = 206 or (l + b) = 103. Solving the two equations, we get: l = 63 and b = 40. Area = (l x b) = (63 x 40) = 2520 sq.m