Question

i need help please help

Answer 1

A mile is 1760 yards; and hour is 3600 (=2x1800) seconds.

So a yard per second is roughly two miles per hour (actually 1800/1760 x2 miles per hour, so the error is about 40 in 1800 or less than 1 in 40, 2.5%) and three yards per second is about 6 miles per hour. Upper bound of the estimate would be 6 + 2.5% = 6+0.15 = 6.15 mph.

if you start using calculators, you didn't look at the word “about” in the question. The ability to estimate quantities like this is your head is really a good skill to develop.

Neil Gordon

Answered September 25

3 yards per second x 3,600 seconds in 1 hour = 10,800 yards per hour

There are 1,760 yards in 1 mile

10,800 yards divided by 1,760 yards = Speed = 6.136 miles per hour

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