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please explain how to do this.

 Dec 10, 2020
 #1
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rate * time = distance     (and the distance each way is equal)

 

50 m/hr * x  =  70 m/hr ( 24/5 -x)                      24/5 is 4 4/5       x is amount of time at 50m/hr

50x = 336-70x

120x = 336

x = 2.8 hrs at 50 m/r                   50 m/hr * 2.8 hr = 140 miles  

 Dec 10, 2020

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