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22.09.2019 •
Mathematics
Antti entered a 10-kilometer race. his goal is to finish in one hour. he starts off sprinting and completes the first 2 kilometers of the race at an average speed of 12 kilometers per hour. to achieve his goal of a one-hour finish time, what average speed (in kilometers per hour) must antti maintain for the last 8 kilometers of the race? enter your answer as a number in decimal form, without units.
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Ответ:
so, first 2 km take 10 min. so, she is left with 50 min and a distance of 8 km
so, required speed = 8km/50min=8*60/50 kmph =9.6 kmph.
Ответ: