John drives 250 km at 50 km/h and then he drives 350km at 70km/h. Find his average speed for the whole journey in km/h.

55 km/h 60 km/h 58 km/h 65 km/h

60 km/h

Distance = Speed × Time Time taken by John to cover 250 km  = \(\frac{250}{50}\) = 5 hours Time taken by John to cover 350 km  = \(\frac{350}{70}\) = 5 hours Average speed = \(\frac{350 + 250}{5 + 5 }\) = \(\frac{600}{10}\) = 60 km/h