Speed of boat a in still water is same as the speed of boat f in still water. Find the differene
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The speed of the boat in still water or ‘b’ is = 13 km/hr. Also, we have the speed of the stream or ‘r’ = 4 km/hr. Here we have to find the time taken by the boat to cover an upstream journey of 68 km. From the basic formula for the speed we have, speed = Distance/Time or in other words we can say that Time = Distance/speed.
We have the Distance for the journey = 81 km. Now we have to find the speed of the boat upstream. The upstream speed is = b – r = 13 – 4 = 9 km /hr.
Therefore using this in the formula for speed, we have: Time = 81/9 = 9 hr = (9 × 60) minutes = 540 minutes.
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