Asked by paul stylo

a lorry and a sports car are traveling a distance of of 21kmh. the difference in there time was 70minutes if the speed of the sports car was 6 times that of a lorry,calculate the speed of each
Answered by oobleck
time = distance/speed, so if the lorry's speed is x, then
21/x = 70/60 + 21/6x
Now just solve for x, and 6x