[計量] Pat drove from his home
Pat drove from his home to school at 60 miles per hour. Returning over the
same route, there was a lot of traffic, and he was only able to drive at 40
miles per hour. If the return trip took 1 hour longer, how many miles did he
drive for the round trip?
a.2
b.3
c.60
d.120
e.240
ans.e
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05/18 12:59, , 1F
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