Swami walks to his school which is at a distance of 4 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back in his friend’s vehicle home in 10 minutes. His average speed in km/h is

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$16 k m / h$

$24 k m / h$

$20 k m / h$

$8 k m / h$

answer is D.

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Detailed Solution

Complete Solution:

Since Swami goes to school and then comes back home, the total distance is:

Total Distance = 4 km (to school) + 4 km (back home) = 8 km

Time taken:

Total time = 30 minutes + 10 minutes = 40 minutes

Convert this time into hours:

Total Time = 40 / 60 = 2/3 hours

Average speed is given by:

Average Speed = Total Distance / Total Time

Substitute the values:

Average Speed = 8 km / (2/3 hours) = 8 × (3/2) = 16 km/h

Final Answer:

Swami's average speed for the entire journey is 16 km/h.

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