Question

A car travells 30 km at a uniform speed of 40km/h and the next 30km at a uniform speed of 20 km/h .Find its average speed

Answer 1

Answer:

Explanation:

Average speed = Total distance covered / Total time taken

Time taken to travel the first 40 km = 1 h  

Time taken to travel the next 30 km = 30km /(20 km/h) = 1.5 h

Total distance travelled = 40 + 30 = 70 km

Total time taken = 1 + 1.5 = 2.5 h

Average speed = 70 km/ 2.5 h

                           = 28 km/h

vishal