The sabarmati express left ahmedabad for mumbai. having travelled 300 km, which constitutes 200/3 percent of the distance between ahmedabad and mumbai, the train was stopped by a red signal. half an hour later, the track was cleared and the engine driver, having increased the speed by 15 km per hour, arrived at mumbai on time. find the initial speed of the sabarmati express.
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60 km/hr
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