Answer:

Step-by-step explanation:
ΔPQS, ΔRQP and ΔRPS are similar (AA). Therefore the sides are in proportion:

We have:

Substitute:
<em>cross multiply</em>

Use the Pythagorean theorem:

Substitute:

X weight 131
---- = -------------
18.8% 100%
Cross multiply and get 24.6 pounds
Just count up from 9:30. 5 and 1/2 hours is the answer