Question 993957
Wendy took a trip from city A to city B, a distance of 910 mi. She traveled part of the way by bus, which arrived at the train station just in time for Wendy to complete her journey by train. The bus averaged 30 mi/h, and the train averaged 115 mi/h. The entire trip took 
10 1/2h.
How long did Wendy spend on the train?

let x=distance Wendy traveled by bus
910-x=distance Wendy traveled by train
distance/speed=travel time
x/30+(910-x)/115=10.5
lcd: (30)(115)
115x+30(910-x)=10.5* (30)(115)
115x+27300-30x=36225
85x=8925
x=105
910-x=805=(distance Wendy traveled by train)
805/115=7
How long did Wendy spend on the train? 7 hrs