The distance between Sarnia and London Ontario,Canada is about 100 km.You cover first 50 km at 40 km/h.In order for you to travel with an average speed of 50 km/h for the entire trip,the speed to cover the second 50 km would be

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To achieve an average speed of 50 km/h over 100 km, the total time taken must be 2 hours (since 100 km / 50 km/h = 2 hours). The first 50 km at 40 km/h takes 1.25 hours (50 km / 40 km/h). To complete the trip in 2 hours, the remaining 50 km must be covered in 0.75 hours (2 hours - 1.25 hours). Therefore, the required speed for the second 50 km is 50 km / 0.75 hours = 66.67 km/h, which rounds to 67 km/h.

The Distance Between Sarnia and London Ontario,Canada Is About 100