Hello, rai2003!

No matter what I do, I get a transcendental equation.

Does anyone see an elementary relationship?

Al and Bob are at opposite ends of a diameter of a silo

in the shape of a right circular cylinder with radius 150 ft.

Al is due west of Bob.

Al begins walking along the edge of the silo at 6 ft/sec.

At the same moment that Bob begins to walk due east at the same speed.

The value closest to the time in seconds when Al first can see Bob is __ ?

The answer is 48.Code:P * * o 6t * *o * * o * . * o o * @ * o A o * - - - - o - - - - - - - - o Q * O 150 *B 6t * * * * * * * * *

We have a circle with center and radius 150.

Al starts at .

In the next seconds, he walks feet to

. . Draw radius

Bob starts at

In the same seconds, he walks feet to

is tangent to the circle: .

Let

The circumference of the semicircle is

Then:

Since arc length is given by: .

. . we have: .

. . . . . and I'm stuck.