A man goes from his house to office with a speed of 57km/hr and returns to the house with a speed of 83km/hr in his car. Calculate the average speed of the car.

70 km/h

Explanation:

The average speed is given by combining the two speeds and dividing them by two

Given

Speed to office as 57 km/h

Speed to house as 83 km/h

The differences in speeds may be due to the terrain of the land

Total speed is 57+83=140 km/h

Average speed is 140/2=70 km/h

Therefore, on average, the car went on a journey at the spees of 70 km/h