A car travels 80 km at 40 km/h, 120 km at 60 km/h, and 100 km at 50 km/h. Find the average speed.
Show answer & explanation
Correct answer: B
Explanation
Distance₁ = 80 km, Speed₁ = 40 km/h
Distance₂ = 120 km, Speed₂ = 60 km/h
Distance₃ = 100 km, Speed₃ = 50 km/h
Total Distance = 80 + 120 + 100 = 300 km
Time₁ = 80 / 40 = 2 hours
Time₂ = 120 / 60 = 2 hours
Time₃ = 100 / 50 = 2 hours
Total Time = 2 + 2 + 2 = 6 hours
Average Speed = 300 / 6 = 50 km/h