A train leaves calcutta at 4.00 pm and travels 40 km an hour, another train leaves calcutta at 4;30pm and travels 50 km an hour, when and where will the second train overtake the rst?
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In 30mins train a will cover 40×1/2=20km
so ,
time taken by train b to catch train a=20/10=2hrs
at the distance of 50×2=100km
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