SOLUTION: A car made a run of 390 km in x hours. If the speed had been 4 km/ hrs more, it would have taken 2 hours less for the journey. Find the value of x.

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Question 958980: A car made a run of 390 km in x hours. If the speed had been 4 km/ hrs more, it would have taken 2 hours less for the journey. Find the value of x.
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
R, rate
T, time
D, distance
RT=D

_______________speed___________time__________distance
As Done________390%2Fx____________x_____________390
Hypoth________390%2Fx%2B4__________x-2____________390

Do you find what to do?

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

A car made a run of 390 km in x hours. If the speed had been 4 km/ hrs more, it would have taken 2 hours less for the journey. Find the value of x.
390%2Fx+%2B+4+=+390%2F%28x+-+2%29

Solve to get: highlight_green%28x+=+15%29