Asked by Riliwan

A man drove for 4hours at a certain speed, he then doubled his speed and drove for another 3 hours.
Altogether he covered 600km. At what speed did he drive for the last 3 hours?
Answered by DrBob222
distance = rate x time.
d = rt
d = 160 = r*4 + 2r*3
Solve for r and 2r. 2r is the speed the last 3 hours.

Post your work if you get stuck.
Answered by Reiny
I am sure DrBob meant:

600 = r*4 + 2r*3
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