A train leaves patna at 5am and reaches delhi at 9 am. Another train leaves delhi at 6.30am and reaches patna at 10am. At what time do the two trains meet?
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Step-by-step explanation:
ratio of time = 4 : 3.5
speed is inversely proportional to time so ratio of their speeds
=1/4 : 1/3.5 = 7:8
distance b/w Pataná and Delhi
= 7x × 4 = 28x
distance covered by trainA till 2nd train
leaves
= 28x/1.5 h = 56x/3 km
remaining dis. = 28x - 56x/3
= 28x/3
their relative speed
= 7x + 8x = 15x
time they will take to meet each other
= 28x/3 /15x = 28/45 *60
= 37 1/3 minutes = 37 mins20seconds
so trains will meet at
= 6:30AM + 37min20sec
= 7:07:20 AM
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