significant figures

Question

On October 3rd, 1931, Major Clyde Pangborn and Hugh Herndon navigated the first nonstop trans-Pacific flight, in the Bellanca cabin monoplane Miss Veedol. They flew 7 335 389.952 m, from Sabishiro Beach, Japan to Wenatchee, Washington, with an average speed of 120 kmph Calculate their time, and write the answer with the correct number of significant figures.

Select one:

a. 61.295 hours

b. 61.2 hours

c. 61 hours

d. 61.30 hours

Answer 1

Hi Gin,

The first thing we need to do is convert the meters to km. I divided the name by a 1000 given that there are 1000 meters to a km. I then took that number and divided by 120 kmph. My answer was 61 Choice, c because I had to use significant figures and use the smallest which was 120