14. A person covers 60 km from P to Q at speed of 20 km/hr and returns from Q to P at speed of 30 km/hr. Find the average speed of person.a. 22 km/hrb. 24 km/hrc. 26 km/hrd. 28.2 km/hr e. None of these
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Answer:
24km / h
Step-by-step explanation:
total distance covered = 60*2 = 120 km.
total time taken=
time taken to go + time taken to return
time taken to go = 60/20 = 3hours.
time taken to return the = 60 / 30 2 hours.
total time taken = 3+2 = 5 hours.
Average speed =
total distance covered / total time taken.
average speed = 120/5
= 24 km/h
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