SOLUTION: A movers van left Middletown at 8:00 am and drove to bayside at an average speed of 70 kilometers per hour. At 9:00 am the same day the Riley's left Middletown following the same r

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Question 734804: A movers van left Middletown at 8:00 am and drove to bayside at an average speed of 70 kilometers per hour. At 9:00 am the same day the Riley's left Middletown following the same route as the van. If both arrived in bayside at 4:00 pm what was the Riley's average speed?
Found 2 solutions by checkley79, josmiceli:
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
D=70(12+4-8) FOR THE VAN.
D=70*8=560 MILES.
560=R(12+4-9)
560=7R
R=560/7
R=80 MPH.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
A movers van left Middletown at 8:00 am and
arrived in bayside at 4:00 pm
This is a period of 8 hrs
+d+=+70%2A8+
+d+=+560+ km
Riley's took 1 hour less time, or 7 hrs
+d+=+r%2At+
+560+=+r%2A7+
+r+=+560%2F7+
+r+=+80+
Riley's average speed was 80 km/hr