The Allisons are on a cross-country trip traveling with the Jensons. One day they get separated and
the Jensons are 20 miles a head of the Allisons on the same road. If the Jensons average 50 mph
and the Allisons travel at 60 mph, how long will it be before the Allisons catch up with the Jensons?
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??
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didn't understood the question
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