Tom travels first 5 kilometers in 80km/hr and another 5 kilometers in 20km/hr. What is his average speed? Pick.
A) 32km/hr
B) 42km/hr
C) 40km/hr
D) 30km/hr
E) 36km/hr
Since the distance traveled is same, we can apply direct formula= 2XS1XS2/(S1+S2)   2X80X20/100= 32. '32km/hr' is the answer.
<result>A</result>
Tom travels first 5 kilometers in 80km/hr and another 5 kilometers in 20km/hr. What is his average speed?