a train covers a distance of 90 km at a uniform speed . it would have taken 30 min less, if the speed had be 15 km/h more .calculate the original duration of journey .
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The train took 1.5 hours or 90 minutes to complete a journey
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a train covers a distance of 90 km at a uniform speed . it would have taken 30 min less, if the speed had be 15 km/h more .calculate the original duration of journey .
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