book Maths Puzzle Numerical Ability

Can someone out there help me solve this problem?

If a person cross-country skis for 35 minutes, how many calories will be burned?
Cross-country skiing burns 700 calories/hour

Thanks,
Sher

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book Other Question
a plane flying the 3458-mile trip from new york city to london has a 50-mph tailwind. the flight's point of no return, is the point at which the flight time required to return to n Suppose a bullet is fired on a distant planet so that its height (in feet) after t seconds is given by h = 4t2(this 2 is an exponet) + 16t + 5

When is the bullet at its heighest