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Question : Directions: The distance between the two cities is 30 km. A man goes at a speed of 30 km per hour and returns at 20 km per hour. What is his average speed?

Option 1: 25 km/hr

Option 2: 24 km/hr

Option 3: 10 km/hr

Option 4: 26 km/hr


Team Careers360 14th Jan, 2024
Answer (1)
Team Careers360 17th Jan, 2024

Correct Answer: 24 km/hr


Solution : Given:
Distance to be travelled = 30km
Speed A = 30km/hr, Speed B = 20km/hr

When the distance is constant, then the average speed = $\frac{2 × Speed A × Speed B}{Speed A + Speed B}$
= $\frac{2 × 30 × 20}{30 + 20}$
= $\frac{1200}{50}$
= 24 km/hr

So, the average speed of the man is 24km/hr. Hence, the second option is correct.

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