A family makes a journey to their native. They travel with a speed of 60 km/hr in 30 minutes and then another speed of 45 km/hr in 20 minutes. What is their average speed?
(A) 15 km/hr
(B) 36 km/hr
(C) 42 km/hr
(D) 54 km/hr
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Answer:
(c): 42 km/hr. is correct answer
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