book Maths Puzzle Numerical Ability

Can someone help me with this problem?

If a person jogs at a rate of 5 1/2 mi/h for 3 1/2 h. in a week, how many calories do they burn? (Calories per hours is 740)

Thanks,
Sher

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book Other Question

At a local high school, the ratio of boys to girls is 3:4. there are 1200 boys in the school. how many girls are there? Find the slope of a line perpendicular to the line y=-3 and passing through (3,4) express your answer in slope intercept form.

Thanks Caroline