on a 140km track travels the first 40 km at a uniform speed of 40 km/hr.how fast the train travel the next 90 km so as to average 70km/hr.for entire trip
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90 km; 120 km; 20 km; 40 km. Correct Answer ... They run at speeds of a m/s and b m/s respectively. ... Arjun travels from A to B, a distance of 200 Km at the speed of 40 Km/hr.
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