Question : A motorist travels to a place 150 km away at an average speed of 50 km/h and returns at 30 km/h. His average speed for the whole journey in km/h is
Option 1: 37.5
Option 2: 37
Option 3: 35
Option 4: 40
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Correct Answer: 37.5
Solution :
Given:
Distance = 150 km
Speed while going = 50 km/h, while coming = 30 km/h
Applying the formula for average speed = $\frac{2xy}{x+y}$
= $\frac{2×50×30}{50+30}$
= $\frac{3000}{80}$
= 37.5 km/h
Hence, the correct answer is 37.5.
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