Question
A train takes 30 minutes to travel 20 km, but due to
maintenance, its speed is reduced by 25% for the next 10 km. Find the total time taken by the train to cover 30 km.Solution
Speed = 20/0.5 = 40 km/h New speed = 40 × 0.75 = 30 km/h Time = 10/30 = 1/3 hour = 20 minutes Total time = 30 + 20 = 50 minutes Answer: b) 50 minutes
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