+205
A biker’s speed is 1.5 times faster than a walker’s speed. They start moving simultaneously in the same direction from the same point and, after 1.5 hours, the distance between them is 12.5 miles. What are their speeds?
+129852 Let the walker's speed in mph = S and the biker's speed = 1.5S
So
(1.5S - S)1.5 = 12.5
.5S (1.5) = 12.5
.75S = 12.5 divide both sides by .75
S = 12.5 / .75 = 50/3 = 16 + 2/3 mph
The walker's speed = 16 + 2/3 mph and the biker's speed = 25 mph
Proof....after 1 hr the biker is 25/3 miles ahead....and after 1.5 hrs the biker is
25/3 + 25 /6 =
[50 + 25 ] / 6 = 75/6 = 12.5 miles ahead
BTW.....that walker would shred all Olympic records !!!!!!
