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An executive drove from home at an average speed of 40 mph to an airport where a helicopter was waiting. The executive boarded the helicopter and flew to the corporate offices at an average speed of 80 mph. The entire distance was 200 mi. The entire trip took 4 h. Find the distance from the airport to the corporate offices.

 Feb 16, 2020
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Let the distance from his house to the airport=D
The distance from the airport to the office =200 - D

 

D / 40 + (200 - D) / 80 =4, solve for D
D = 120 miles - distance from his house to the airport.
200 - 120 = 80 miles - distance from the airport to the office.

 Feb 16, 2020

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