Question

A boy goes from his house to school with a speed of 8 km per hour and returns from school to house with a speed of 10 km per hour. Find his average speed?
1. 9.6 kmph
2. 10.2 kmph
3. 8.6 kmph
4. 8.9 kmph

Answer 1

Correct Answer - Option 4 : 8.9 kmph

GIVEN:

A boy goes from his house to school with a speed of 8 km per hour and returns from school to house with a speed of 10 km per hour.

FORMULA USED:

Average speed = 2XY/(X + Y)

CALCULATION:

X = 8 kmph, Y = 10 kmph

So,

Average speed = 2XY/(X + Y)

⇒ 160/18

⇒ 8.9 kmph

∴ His average speed is 8.9 kmph.