Answer:
After 2.5 hours they will be 15 miles apart.
Explanation:
Speed of bike = 20 mph
Speed of cycle = 14 mph
They are moving in the same direction
Relative velocity = 20 - 14 = 6 mph
We need to find after how many hours will they be 15 miles apart.
Distance = 15 miles
Velocity = 6 mph
Distance = Velocity x Time
15 = 6 x Time
Time = 2.5 hours
After 2.5 hours they will be 15 miles apart.