Question

A car covers the first 78 km. of the journey in 90 minutes and the remaining 50 km. in 70 minutes. What is the average speed of the car?
1. 50 km/hour
2. 48 km/hour
3. 40 km/hour
4. 55 km/hour

Answer 1

Correct Answer - Option 2 : 48 km/hour

Given:

Total Distance cover = 78 + 50 = 128 km

Total time taken = 90 + 70 = 160 minutes = \(160\over 60\) hours

Formula use:

Average speed = Total Distance Travelled / Total Time taken

Calculation:

Average speed = \(128 \over {160\over60}\)

Average speed = \({128 \over 160} ×60\)

Average speed = 48 km/hour

Therefore, the average speed of the car is 48 km/hour.

Hence, the correct answer is 48 km/hour.