Question 1031904
Convert to minutes:
3*60 = 180 minutes
and 600/400 = 1.5 It takes 1.5 times longer coming back
x+1.5x= 180
2.5x = 180
x = 72 minutes is the fast speed
and
72*1.5 = 108 is the fast speed
72+108=180 minutes and 180/60 = 3 hours of flight total.