Viswam walks half a mile to get to school each day. His route consists of 1010 city blocks of equal length and he takes one minute to walk each block. Today, after walking 55 blocks, Viswam discovers he has to take a detour, walking 33 blocks of equal length instead of one block to reach the next corner. From the time he starts his detour what speed, in mph, must he walk in orde to get to school at his usual time?
A. 4.0
B. 4.2
C. 4.5
D. 4.8
E. 5.0

Distance = speed × time中文
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B. 4.2

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