Question

A person covers 40% of the distance from A to B at 8 km/ h, 40% of the remaining distance at 9 km/h and the rest at 12 km/h. His average speed (in km/h) for the journey is:

विकल्प

• `9 5/8`

• `9 2/3`

• `9 3/8`

• `9 1/3`

Answer 1

`9 3/8`

Explanation:

Let total distance = 100 km

Average speed = `100/(40/8 + 24/9 + 36/12)`

= `100/(8 + 2 2/3)`

= `100/(10  2/3)`

= `300/32`

= `9 3/8`