Question

John bikes at a speed of 10 miles per hour. His friend Brian is slower, his biking speed is only

8 miles per hour.
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Today the boys went for a 20 miles trip, each boy was biking at his usual speed. How long did John wait for Brian at the finish line?

Answer 1

1/2 hours

Explanation:

Answer 2

30 Minutes

20/10=2 hours (John)
20/8=2.5 (Brian)
2.5-2=.5=30 minutes