Question 333507
A car traveled for 1/2 hour at r mi/h , then increased the speed by 10 mi/ and traveled for 1 and 1/2 hours more. how far did the car go ( the answer must be expressed in the form of r )
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the speed of car was r mph
it traveled for half hour.
distance traveled = 1/2 *r
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then speed was (r+10)mph
time driven = 3/2 hours
distance traveled = 3/2 * (r+10)
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Total distance traveled = {{{r/2 + 3/2*(r+10)}}}
={{{(r+3r+10)/2}}}
={{{(4r+10)/2}}}
={{{2*(2r+5)/2}}}
={{{2r+5 }}}miles