You plan a trip on which you want to average a speed of 85k/h. you cover the first half of the distance at an average speed of only 62k/h.
What must be your average speed in the second half of the trip to meet your goal?

Answer in units of k/h.

Looking for the formula to solve this problem. How would it be set up?

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What do you think the answer is? We can help you if you provide what you think the answer is.

Hint: speed= distance/time, and time = distance/speed. You need an expression for time for each half of the journey, then total distance divided by sum of the two times is the average speed.