Question

To reach playground Ramu has to travel 4 km from his home. Ramu travelled 2 km by bus with a speed of 40 km/hr and remaining 2 km by bicycle with speed of 8 km/hr. Find the average speed.

• A. 13.33
• B. 15
• C. 10
• D. 16.33

Answer 1

The correct option is A

13.33

In this question, the distance travelled is same in both cases but the time taken is not same.

So, the average speed will be harmonic mean of both speeds.

$⟹$ Average speed = $\frac{2\times 40\times 8}{40+8}$

= $\frac{640}{48}$

= 13.33