Question 11816
let the distance one way = x

time taken to go to friends place = x/80
time taken on way back  = x/70

total time = x/80 + x/70 = 3

(70x + 80x)/(70*80) = 3
150x = 3*70*80
x = 3*70*80/150
x = 112 Km

total distance  = 224 Km

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