Question
Find the average speed of boat A to cover the given
distance if the speed of boat A in still water is 20km/hr?Solution
Total distance travelled by boat A = 50kms Speed of stream = 5 km/hr Speed of boat A in still water = 20 km/hr Upstream speed = 15 km/hr Downstream speed = 25 km/hr Upstream distance = 40% of 50 kms = 20 kms Downstream distance = 50 kms – 20 kms = 30kms  Time taken to travel upstream = km/hr = km/hr Time taken to travel downstream = km/hr = km/hr Average speed = = = 19.74 km/hr Hence, option 3 is the correct answer
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