two trains are passing in opposite direction at 11 o clock and speed of two trains are 40km/h and 50km/h .at what time the distance between two trains are 720 km.?
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Since trains are going in opposite direction there relative speed will be sum = 50 + 40 = 90, km/h
Time taken = 720÷90 = 8 hours
So time will be 11 + 8 = 19 : 00 or 7 PM
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