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A life raft, set adrift from a sinking ship 150 miles offshore, travels directly toward
a Coast Guard station at the rate of 5 miles per hour. At the time that the raft is set adrift,
a rescue helicopter is dispatched from the Coast Guard station. If the helicopter’s average speed
is 90 miles per hour, how long will it take the helicopter to reach the life raft?
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The initial distance is 150 miles.
The distance decreases by 5+90 = 95 miles each hour.
It is the rate of the distance decrease.
Hence, the needed time for the helicopter to reach the life raft is
= = 1.578947 hours,
or 1 hour and 35 minutes, approximately. ANSWER
Solved.