Linda and Dave leave simultaneously from the same starting point biking in opposite directions. Linda bikes at 7 miles per hour and Dave bikes at 9 miles per hour. How long will it be until they are 24 miles apart from each other?
a. 12 hrs
b. 2 / 3 hrs
c. 8 / 21 hrs
d. 1 1 / 2 hrs
2007-10-07 07:30:59 · 5 answers · asked by . 1 in Science & Mathematics ➔ Mathematics
7t+9t=24
16t=24
t=1½ hrs choice d
2007-10-07 07:34:13 · answer #1 · answered by chasrmck 6 · 0⤊ 0⤋
The relative speed between the two is 7 + 9 = 16.
It takes 24 / 16 = 1 1/2 hr
So the answer is d
2007-10-07 14:34:40 · answer #2 · answered by norman 7 · 0⤊ 0⤋
Yep, everyone is right---it is d. an hour and a half. Everyone gets an "A". Happy trails
2007-10-07 14:48:37 · answer #3 · answered by hillbilly 7 · 0⤊ 0⤋
d, 1.5 hours
2007-10-07 14:34:55 · answer #4 · answered by Rutgers101 2 · 0⤊ 0⤋
How about (d) ?
2007-10-07 14:35:59 · answer #5 · answered by jayemess 4 · 0⤊ 0⤋