A person travels in a car at 40 km/h for 3 hours, on a bike at 30 km/h for 2 hours, and in a train at 80 km/h for 5 hours. What is the average speed at which he travelled?

58 km/h

Distance = Speed × Time

Distance 1 = 40 ×3 = 120 km 

Distance 2 = 30 ×2 = 60 km

Distance 3 = 80 × 5 = 400 km

Average speed = \(\frac{120+ 60+ 400}{3 + 2 + 5 }\)

= \(\frac{580}{10 }\)

= 58 km/h