1. If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?
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By: anil on 05 May 2019 01.45 am
average speed = $$frac{2ab}{a+b}=frac{2(30)(60)}{30+60}=40$$ So the answer is option C.
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