If bill rides his bike 3 miles to Fred’s house and then walks with Fred the remaining 1 mile to school, it will take him 30 minutes. But if

Question

If bill rides his bike 3 miles to Fred’s house and then walks with Fred the remaining 1 mile to school, it will take him 30 minutes. But if he rides the entire distance, it will take him only 20 minutes. what is his walking and biking speed?

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    2021-09-06T03:43:44+00:00

     Total distance is 4 miles. If he rides, he makes it in 1/3 of an hour (20 minutes). 

    4=1/3x 

    x=12 

    Knowing that he bikes at 12 miles an hour, we can determine the time it will take him to go 3 miles. 

    3 (miles traveled)/ 12 (miles an hour)=1/4 hour or 15 min. 

    So, he will have 15 min. left to walk one mile. 

    60 (minutes in an hour)/ 15 minutes per mile=4 mph.

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