Question

A person travels a distance of 30 km by car at a speed of 60 kmph and a distance of 50 km at a speed of 25 kmph by bus. What is the average speed?
1. 25 kmph
2. 30 kmph
3. 32 kmph
4. 40 kmph

Answer 1

Correct Answer - Option 3 : 32 kmph

Given:

The speed of the person to cover 30 km = 60 km/h

The speed of the person to cover 50 km = 25 km/h

Formula used:

Time = Distance/Speed

Average speed = Total distance/Total time taken

Calculation:

The time taken to cover 30 km = 30/60 h

⇒ 1/2 h

The time taken to cover 50 km = 50/25 h

⇒ 2 h

Average speed = (30 + 50)/(2 + 1/2)

⇒ 80/(5/2)

⇒ 80 × (2/5)

⇒ 16 × 2

⇒ 32 km/h

∴ The average speed is 32 km/h.