Vinnie drives his car 210 miles and has an average of a certain speed. If the average speed had been 3mph more, he could have tr
aveled 228 miles in the same length of time. What was his average speed?
2 answers:
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Answer:
35 mph
Step-by-step explanation:
time = distance / speed
210 miles and has an average of a certain speed
t = 210 / s
If the average speed had been 3mph more, he could have traveled 228 miles in the same length of time
t = 228 / (s + 3)
Set equal
210 / s = 228 / (s + 3)
Cross multiply
210s + 630 = 228s
Subtract 210s from both sides
630 = 18s
Divie both sides by 18
35 = s
35 mph
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