SOLUTION: A spider drops from the ceiling of Linda's porch and then climbs back up its web to its web to the ceiling. The speed on the trip down is 0.45 ft/sec, and the speed back up is 0.15

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Question 469003: A spider drops from the ceiling of Linda's porch and then climbs back up its web to its web to the ceiling. The speed on the trip down is 0.45 ft/sec, and the speed back up is 0.15 ft/sec. If the round trip took 80 seconds, how high is the ceiling?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
n/.45+n/.15=80
.15n+.45n=5.4
15n+45n=540
60n=540
n=9 ft. to the ceiling..