Question 483258
Let distance from A to B be "D" km

Time taken to reach from A to B = D/81 hr

Return time by bus from B to A = D/54 hr

Total travelling time  
D/81 + D/54  = 5

54D + 81D = 5*81*54

135 D = 21870

D = 21870/135 = 162

Trip by Car = 162/81= 2 hrs 

Ans : Trip by car Distance 162km in 2 hrs