GIVEN: Total time spent = 8 hours Distance travelled at 40 km/hr = x/2 Distance travelled at 60 km/hr = x/2 CONCEPT: Here we need to understand that half of the distance is travelled at one speed and another half at different in the total time of 8 hours. FORMULAE USED: Time = Distance/Speed CALCULATION: 8 = (x/80) + (x/120) ⇒ 8 = x/48 ⇒ x = 384 ∴ Distance travelled is 384 km