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Two persons P and start at the same tim...

Two persons P and start at the same time from city A for city B, 60 km away. P travels 4 km/hr slower than Q. Q reaches city B and at once turns back meeting P, 12 km from city B. What is the speed of P?

A

8 km/hr

B

12 km/hr

C

16 km/hr

D

20 km/hr

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