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A car covers three fourth of the distance in 40 minutes and the remaining distance in 80 minutes. The total distance of the journey is 160 km. find the average speed of the car in km/h.


1. 80 km/h
2. 90 km/h
3. 85 km/h
4. 70 km/h
5. 95 km/h

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Best answer
Correct Answer - Option 1 : 80 km/h

Given:

The total distance covered is 160 km

A part of the journey covered in 40 min

Another part of the journey covered in 80 min

Formula used:

\(Speed = \frac{{Distance}}{{Time}}\)

\(Average\;speed = \frac{{Total\;distance}}{{Total\;time}}\)

Calculation:

Distance of first part of journey = (3/4) × 160 = 120 km

Distance of second part of journey = 160 - 120 = 40 km

Total time (in minutes) = (40 + 80) min

⇒ Total time (in hours) = 120/60 = 2 h

⇒ \(Average\;speed = \frac{{120 + 40}}{2} = \frac{{160}}{2} = 80\;km/h\)

 The average speed of the journey is 80 km/h

 

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