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math70
An executive drove from home at an average speed of 30 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 75 mph. The entire distance was 156 mi. The entire trip took 3 h. Find the ...
Saturday, October 22, 2011 at 11:45am by Helo

math70
first distance --- x miles distance by helicopter -- 156-x x/30 + (156-x)/75 = 3 times 150 5x + 2(156-x) = 450 5x + 312 - 2x = 450 3x = 138 x = 46 distance from airport to office = 156-46 = 110 check: 46/30 + 110/75 = 3
Saturday, October 22, 2011 at 11:45am by Reiny

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