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a bus covers a certain distance in 42 minutes if it runs at a speed of 50 km per hour. what must be the speed of the bus in order to reduce the time of the journey to 30 minutes |
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Answer» Let the distance be D km we KNOW that, Distance = Speed x Time ∴ D = 50 km x 42/60 HR = 35 km Now, Time = 30 minutes = 30/60 hr = 1/2 hr ∴ NEW speed of the bus = Distance / Time = 35 km / (1/2) hr = 70 km/hr |
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