Answer:
2.4 hours
Step-by-step explanation:
Let x = hours riding on bike
One cyclist covers 10 miles for every hour, so multiply x by 10 like this: 10x
Other cyclist covered 15 miles for every hour, so multiply x by 15 like this: 15x
They will both add up to 60
10x + 15x = 60
25x = 60
Divide both sides by 25
25x/25 = 60/25
x = 2.4