help!

• Jun 20th 2006, 12:26 AM
prisci_pq
help!
Tyrone leaves city A on a moped traveling toward city B at 18 mph. At the same time, Tina leaves city B on a bicycle traveling toward city A at 14 mph. The distance between the two cities is 112 mph. How long will it take before Tyrone and Tina meet?
• Jun 20th 2006, 01:12 AM
malaygoel
Quote:

Originally Posted by prisci_pq
Tyrone leaves city A on a moped traveling toward city B at 18 mph. At the same time, Tina leaves city B on a bicycle traveling toward city A at 14 mph. The distance between the two cities is 112 m. How long will it take before Tyrone and Tina meet?

Let Tyrone travels distance x
hence,
Tina will travel distance (112 - x)
Let they travel for time t
For Tyrone, t= x/18
For Tina, t=(112 - x)/14
Since they have travelled for the same time,
hence x/18= (112 - x)/14
32x = 112*18
x=63m
t=63/18 = 3.5h

Keep Smiling
Malay
• Jun 20th 2006, 01:16 AM
Navesh
time taken
Let the time taken be $t$ seconds.
distance travelled from a $=18t$hours
distance travelled from b $=14t$hours
total distance $=112m$
$18t+14t=112$
$t=3.5hours$
• Jun 22nd 2006, 03:23 PM
prisci_pq
thank u!
thank you guys so much!! lifesavers!!!! :D
• Jun 22nd 2006, 07:18 PM
Soroban
Hello, prisci_pq!

Here's a back-door approach to this problem . . .

Quote:

Tyrone leaves city A on a moped traveling toward city B at 18 mph.
At the same time, Tina leaves city B on a bicycle traveling toward city A at 14 mph.
The distance between the two cities is 112 miles.
How long will it take before Tyrone and Tina meet?
Tyrone is traveling toward Tina at 18 mph.
Tina is traveling toward Tyrone at 14 mph.
. . Their combined speed is 32 mph.
It is as if Tyrone waits at city A and Tina travels toward him at 32 mph.

How long does it take Tina to travel 112 miles at 32 mph?

Answer: . $\frac{112\text{ miles}}{32\text{ mph}} \:=\:3.5\text{ hours.}$