Asked by Anonymous
A car travel at constant speed from Q to R, a distance of 300 km apart. If the drive increases the speed by 5 km/h, the journey will take 2 hours less. Find the original speed of the car.
Answers
Answered by
Reiny
Original speed --- x km/h
time at original speed = 300/x hrs
new speed ---- x+5
time at new speed = 300/(x+5)
300/x - 300/(x+5) = 2
solve for x, after multiplying all terms by x(x+5) to get your quadratic
time at original speed = 300/x hrs
new speed ---- x+5
time at new speed = 300/(x+5)
300/x - 300/(x+5) = 2
solve for x, after multiplying all terms by x(x+5) to get your quadratic
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