Question
A boat's speed in still water allows it to cover 120 km
in 8 hours. The current's speed is 20% of the boat's speed. How long will it take the boat to travel 96 km upstream against the current?Solution
Speed of the boat in still water = 120 ÷ 8 = 15 km/h Speed of current = 15 × 0.2 = 3 km/h Therefore, upstream speed of the boat = 15 – 3 = 12 km/hr Required time taken = 96 ÷ 12 = 8 hours
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