Question 75518
distance = rate X time...the distances are the same so (rate out)X(time out)=(rate back)X(time back)...let x=(time back)


(time out)+(time back)=3...so (time out)=3-(time back)


320*(3-x)=280*x...or 960-320x=280x...or 960=600x...so x=1.6 hrs...or 1 hr 36 min