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A person starting from his house covers a distance at 15 km/hr and returns to the starting place at 10 km/hr. His average speed during whole journey is

Option 1)

11 km/hr

Option 2)

12 km/hr

Option 3)

$7\frac{1}{2}km/hr$

Option 4)

10 km/hr

Option 5)

13 km/hr

Answers (1)

best_answer

Average speed = (2xy)/(x+y)

= (2 x 15 x 10)/ (15+10) => 12k/hr

Posted by

rishi.raj

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