A woman traveled 20 kilometer in 14 meter per second and another 20 kilometer in 18 miles per second. what is the average speed of the entire trip? Choose the most appropriate option.
A) 12.25	B) 13.75	C) 15.75	D) 18.25	E) 19.75
Since the distance traveled is same, we can apply direct formula= 2XS1XS2/(S1+S2)   2X14X18/32= 15.75. '15.75' is the answer.
<result>C</result>
A woman traveled 20 kilometer in 14 meter per second and another 20 kilometer in 18 miles per second. what is the average speed of the entire trip?