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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90 mi/h 150 mi 5 mi/h ✈