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distance = 10×0.5 = 5 km
Avg speed between 9:00 to 10:00 i.e. in 1 hr
= total distance travelled / total time taken
= 5/1
= 5 km/hr
Time between 9:15 to 10:00 = 45 min = 3/4 hr
avg speed = 5*4/3 = 20/3 = 6.66 km/hr
hope it will help