If Jason traveled 30 miles in 6 hours and Katie traveled three times as far in half the time, what was Katie’s average speed, in

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问题 If Jason traveled 30 miles in 6 hours and Katie traveled three times as far in half the time, what was Katie’s average speed, in miles per hour?

选项 A、5
B、15
C、30
D、45
E、90

答案C

解析

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