Question

Please explain this to me.

On a race track the speed for the first lap is 30 mph. What must be the average speed for a second one mile lap in order to have an average speed of 60 mph for the two laps (miles)?

Answer 1

I guess it would be 90 mph.
\[\frac{ 30 mph + 90 mph }{ 2 } = 60 mph\]

Answer 2

Are you still having trouble about this @nadialabish94 ?

Answer 3

i dont undersand where the 90 comes from

Answer 4

It was just a hunch on my part, here's how you normally do it :
(30+x)/2 = 60
Solve for x to get your answer.

Answer 5

okay thanks :)

Answer 6

No probs !