Hello, samtheman17!

Code:

3
C * - - - o B
| *
4 | * 5
| *
A o

The width of the water is: km.

The distance from to is: km.

Pythagorus tells us that: km.

He will start at , row to , then run to

Code:

x P 3-x
C * - - - * - - - - * B
| /
| /
| / y
4 | /
| /
|θ/
|/
A *

Let

Let , then:

Let

In right triangle

He rows km at 4 km/hr.

. . This will take him: . hours.

Then he runs km at 3 km/hr.

.This will take him: . hours.

Hence, his total time is: . .[1]

We want this answer in terms of θ.

In right triangle .[2]

Note that: .

. . Hence: . .[3]

Subnstitute [2] and [3] into [1]: .

Therefore: .