Question

A person covers the first 176 kilometers at a speed of 16 kilometers/hour and the next 64 kilometers at a speed of 32 kilometers/hour. What would be the approximate average speed for the first 240 kilometers of the journey?

A. 13 Km/h

B. 27 Km/h

C. 18.5 Km/h

D. 21 Km/h
1. B
2. D
3. A
4. C

Answer 1

Correct Answer - Option 4 : C

Given:

Total distance = 240 km

Speed for 176 km = 16 km/hour

Speed for 64 km = 32 km/hour

Formula used:

Speed = Distance/Time

Average speed = Total distance/total time

Calculation:

According to question

Time required to cover 176 km,

Time = Distance/speed

⇒ 176/16 = 11 hour

Time required to cover 64 km,

Time = Distance/speed

⇒ 64/32 = 2 hour

Total time required to cover 240 km = 11 + 2 = 13 hour

Average speed = Total distance/total time

⇒ 240/13

⇒ 18.46 km/hour

∴ The approximate average speed for the first 240 kilometers is 18.5 km/hour