Question
Two cars X and Y start from two places A and B
respectively which are 700 km apart at 9 a.m. Both the cars run at an average speed of 60 km/hr towards each other. Car X stops at 10 a.m. and again starts at 11 a.m. While the other car Y continues to run without stopping. When do the two cars cross each other?Solution
Till 11 a.m. Dist. Covered by X = 60 km and Till 11 a.m. Dist. Covered by Y = 120 km Remaining distance to be covered at 11 a.m. = 700 – 180 = 520 km Relative speed of X and Y = 120 Km / hr ∴ Time taken = 520/120 =13/3 hrs. =  4 hrs. 20 min. ∴ Two cars will cross each other at 3.20 p.m.
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