Answer:
7 miles per hour
Explanation:
Data:
Rate of current = 5 miles / hr
The solution to this problem is in two parts:
1) Rowing team going with the current covering 60 miles
2) Rowing team going against the current covering 10 miles
The formula used to calculate rate will be :
Velocity =
= v =

1) Rowing team going with the current covering 60 miles
Distance = S = 60 miles
Rate = velocity = Rate of Current + Rate of rowing team =
= 5 +
using the velocity formula:
5 +
=
--------------------- Equation. 1
2) Rowing team going against the current covering 10 miles
Distance = S = 10 miles
As the current is against the direction of rowing team so the rate of current will be subtracted from the rate of rowing team.
Rate = velocity = Rate of rowing team - Rate of Current =
=
- 5
Using velocity formula:
- 5 =

Cross multiplying
t = (10) ÷ (
- 5)
put this in equation 1.
we get :
5 +
= (
)
- 5
5 +
= (6)
- 5
5 +
=
- 30
5 + 30 =
-

35 =
=

= 7 miles/hr
rate of the rowing team boat in still water=7 miles/hr