Question
Boat βAβ covers 150 km in downstream in 15 hours. If
the speed of stream is 2 km/hr then find the time taken by boat βAβ to cover 108 km in upstream.Solution
Downstream speed of boat βAβ = 150/15 = 10 km/hr Speed of boat βAβ in still water = 10 β 2 = 8 km/hr Upstream speed of boat βAβ = 8 β 2 = 6 km/hr Time taken by boat βAβ to cover 108 km in upstream = 108/6 = 18 hours
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