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Question

Train P and train Q start from the same point on parallel tracks with speeds of 8 km/hr and 16 km/hr respectively. After 2 hours, train P doubles its speed, and train Q reduces its speed by 50%. They then reach the destination together. Find the total time taken from the start.

A 2 hrs

B 4 hrs

C 7 hrs

D 10 hrs

E None of these

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