The distance around the circumference of the earth is 2.5 × 104 mi. An average person’s shoulder width (that is, the distance between the shoulders) is 18 in.
(a) How would you express an average person’s shoulder width in miles? Write your answer in scientific notation and round to the nearest tenth. Show your work. (1 mi = 63,360 in.)
(b) How many people would it take to wrap around the circumference of the earth once if they were standing shoulder to shoulder? Write your answer in scientific notation and round to the nearest tenth. Show your work.

Question

The distance around the circumference of the earth is 2.5 × 104 mi. An average person’s shoulder width (that is, the distance between the shoulders) is 18 in.   
(a) How would you express an average person’s shoulder width in miles? Write your answer in scientific notation and round to the nearest tenth. Show your work.  (1 mi = 63,360 in.) 
(b) How many people would it take to wrap around the circumference of the earth once if they were standing shoulder to shoulder? Write your answer in scientific notation and round to the nearest tenth. Show your work.