標題:
speed problems
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發問:
First you travel 260 miles at 52 mph. Then you travel 90 miles at 45 mph. What is your average speed?Aircraft A and aircraft B are 720 miles apart and move towards each other. The speed of aircraft A is 114 mph and the speed of aircraft B is 366 mph. Where will both aircraft meet (distance from the... 顯示更多 First you travel 260 miles at 52 mph. Then you travel 90 miles at 45 mph. What is your average speed? Aircraft A and aircraft B are 720 miles apart and move towards each other. The speed of aircraft A is 114 mph and the speed of aircraft B is 366 mph. Where will both aircraft meet (distance from the startpoint of aircraft A)? ...
最佳解答:
time taken: (260/52)+(90/45) =7h average speed: (260+90)/7 =50mph time taken: 720/(114+366) =1.5h distance from the startpoint of aircraft A: 114*1.5 =171m
其他解答:
(260+90)/(260/52+90/45)=50mph (720/(114+366))114=171miles
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