BOAT AND STREAM QUESTION
THE SPEED OF A MOTOR-BOAT IS THAT OF THE CURRENT OF WATER AS 36:5. THE BOAT GOES ALONG WITH THE CURRENT IN 5 HOURS 10 MINUTES. IT WILL COME BACK IN ? LET THE SPEED OF MOTOR BOAT BE 36x kmph, AND SPEED OF CURRENT = 5x kmph THE BOAT GOES ALONG WITH THE CURRENT IN 5 HOURS 10 MINUTES i. e. 31/6 HOURS THEREFORE, DISTANCE = 31/6 * (36x + 5x) = (41x * 31) / 6 km, RATE UPSTREAM = 36x - 5x = 31x kmph THEREFORE, TIME TAKEN = (41x * 31/6) / 31x =41/6 HOURS OR 6 HOURS 50 MINUTES....