<PRE><B>Question 955515</B>
We are given two formulas for rate * time = distance
60*t = d1, where t is time and d1 is distance for first part of trip
50 *(t+(1/2)) = d1+10, where (1/2) is half an hour or 30 minutes
substitute for d1 in second equation
50 *(t+(1/2)) = (60*t)+10
50t +25 = 60t +10
10t = 15
t = 15/10 = 1.5 hours, therefore
60*1.5 = 90 kilometers and
90 + 10 = 100 kilometers and
90 + 100 = 190 kilometers
now 190 kilometers is the total distance

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