SOLUTION: A cyclist travels from town X to town Y at an average speed of 10km/hr and then travels back to town X at an average speed of 10.5km/hr. If the total time for the journey is 1¼hrs

Algebra ->  Length-and-distance -> SOLUTION: A cyclist travels from town X to town Y at an average speed of 10km/hr and then travels back to town X at an average speed of 10.5km/hr. If the total time for the journey is 1¼hrs       Log On


   

Question 1126655: A cyclist travels from town X to town Y at an average speed of 10km/hr and then travels back to town X at an average speed of 10.5km/hr. If the total time for the journey is 1¼hrs and the speed is constant in each direction, find correct to one decimal place XY.
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
d%2F10%2Bd%2F10.5=1.25
d%2810.5%2B10%29=10.5%2A10%2A1.25
highlight%28d=6.4%29

---- 
           SPEED       TIME        DISTANCE

X to Y     10          d/10         d

Y to X     10.5        d/10.5       d

TOTAL                 1.25


EQUATION:   d%2F10%2Bd%2F10.5=1.25