A car travels up a hill at a constant speed of 21 km/h and returns down the hill

Question

A car travels up a hill at a constant speed of 21 km/h and returns down the hill at a constant speed of 53 km/h. Calculate the average speed for the round trip. I've tried getting average speed by adding the two speeds together then dividing by 2 to get 37 km/h but the website says it's not correct. Is there another way to do this??
A car travels up a hill at a constant speed of 21 km/h and returns down the hill at a constant speed of 53 km/h. Calculate the average speed for the round trip. I've tried getting average speed by adding the two speeds together then dividing by 2 to get 37 km/h but the website says it's not correct. Is there another way to do this??

Explanation / Answer

average speed = total distance traveled /total time = [53 +21 ] / 2 = 37 km /h = 37 * 1000 / [60 *60 ] m/s = 370 /36 = 10.277 m/s ************** you are correct *****************

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