After traveling 120 miles in 3 hours Rebecca reduced the speed of the sled by 10 miles per hour. How long did it take her to travel the next 450 miles?

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The answer isn't 5 hours.

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Answer 1 · 2018-03-26T01:31:32

It'd take her #15hrs# to travel the next 450 miles.

Rebecca first travels #120mi# in #3hrs# so

#(120mi)/(3hrs)=40mph#

Then she slows down by #10mph# so

#40mph-10mph=30mph#

She has to travel #450mi# going at the speed of #30mph# so

#(450mi)/(30mph)=15hrs#