SOLUTION: James left home and travelled towards the moumtains.Lisa left 2.1 hours later travelling 35 km/h faster in an effort to catch him. After 1.2 hours Lisa finally caught up with him.W

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: James left home and travelled towards the moumtains.Lisa left 2.1 hours later travelling 35 km/h faster in an effort to catch him. After 1.2 hours Lisa finally caught up with him.W      Log On

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Question 729590: James left home and travelled towards the moumtains.Lisa left 2.1 hours later travelling 35 km/h faster in an effort to catch him. After 1.2 hours Lisa finally caught up with him.What was James average speed?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
James left home and travelled towards the moumtains.Lisa left 2.1 hours later travelling 35 km/h faster in an effort to catch him. After 1.2 hours Lisa finally caught up with him.What was James average speed?
.
Let x = james average speed (km/h)
then
x+35 = lisa's average speed (km/h)
.
1.2 hours = Lisa's driving time
1.2+2.1 = 3.3 hours = James' driving time
.
our equation
1.2(x+35) = 3.3x
1.2x+42 = 3.3x
42 = 2.1x
42/2.1 = x
20 mph = x