A,B, and C are on a trip by a car. A drives during the 1st hour at an average speed of 50km/hr. B drives during the next 2 hours at an average speed of 48km/hr. C drives for the next 3 hours at an average speed of 52km/hr. They reached their destination exactly after 6 hours. Their mean speed is?
Choose the correct option
A) 45.5km/hr
B) 50.3km/hr
C) 56.9km/hr
D) 62.5km/hr
E) 38.9km/hr
Total distance traveled = 50*1 + 48*2 + 52*3= 
<gadget id="calculator">50*1 + 48*2 + 52*3</gadget>
<output>302</output>
302km   Total time taken= 6hrs   Mean speed = 302/6 = 50.3km/hr   Answer is 50.3km/hr
<result>B</result>
A,B, and C are on a trip by a car. A drives during the 1st hour at an average speed of 50km/hr. B drives during the next 2 hours at an average speed of 48km/hr. C drives for the next 3 hours at an average speed of 52km/hr. They reached their destination exactly after 6 hours. Their mean speed is?