Question

travelling south at a rate of 20 miles/hr while B is travelling east at 30 mi/hr. How fast is the distance between them changing 1 hour later a. 2 miles /hour b. 4 miles/hour c. 5 miles/hour d. 6 miles/hour 16. The depth of the water in a cylind rical tank 4 m in diameter is increasing at the rate of 0.7 m/min. Find the rate at which the water flowing into the tank a. 5.8 cubic meter per minute b. 8.8 cubic meter per minute c. 10.2 cubic meter per minute d. 16.6 cubic meter per minute 17. A balloon is rising vertically over a point A on the ground at the rate of 15 ft per second. A point B is on the ground level with and 30 feet from A. When the balloon is 40 feet from A, at what rate is its distance from B changing? a. 12 ft/sec b. 10 ft/sec c. 8 ft/sec d. 6 ft/sec

Answer 1

D=4m 0mHin Wati rat at 2 Cubic H lpeiumt T1x 16 4 c 8.79 1-7 8.8

. o-Yo'= Pr** dhe + 2x (60-4) -dy dt at 2え g80x30 + 2x (40) (-20) -2x 50x z 1S00 -160o 200 2 mles hr 17 I00 100

40 Plalloon 30t 2 2 M+B0 30 2 n 40X 15 St yer 50 12. 6t/sec