Question

Mariah walks 6 miles per hour. Bobby walks 4,400 yards in a half-hour. Given that 1 mile = 1,760 yards, how much faster does Mariah walk than Bobby, in miles per hour?

Answer 1

Answer: 1 mph

Explanation:

Given

Speed of Mariah is
`v_m=6\ mph`

Bobby walks 4400 yards in 0.5 hr

speed of bobby is

`v_b=(4400)/(0.5* 1760)=5\ mph\quad [\text{converting yards into miles by dividing by 1760}]`

The difference in the speed of Mariah and bobby is

`\Rightarrow v_m-v_b=6-5=1\ mph`