In the morning, john drove to his mother's house in the village at an average speed of 60 kilometers per hour. when he was going back to town in the evening, he drove more cautiously and his speed was lower. if john went the same distance in the evening as in the morning, what was john's average speed for the entire trip?

, where v2= velocity at the end and v1= velocity in the beggining

Explanation:

Asuming that v=K, where k= velocity lower than 60[km/h] we can make an equation for a average speed to entire trip as follows:

The equation of average is: , where v2= velocity at the end and v1= velocity in the beggining. Where v1=60 [km/h] becouse is the average velocity of half trip, and v2=k.

That means that jhon´s average speed decreses

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

happy to

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real, smaller and upside-down.   so the answer should be b.