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ATQ, Let speed of bus X be a km/hr. So, speed of bus Y = (a+600/2-280) = (a+20) km/hr. Distance covered by bus X and Y together in one hour = ((3×6+2))/4×60 = 300 km ATQ, a+a+20=300 a=140 Total distance between Delhi and Jaipur = a×4+(a+20)×2+20 = (6a+60) = 900 = 1.5D
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