A man travels 100km by train at 60km/hr, 200km by ship at 20km/hr, 300km by aeroplane at 100km/hr and 100km by car at 50km/hr. What is the average speed for the entire distance?
Choices:
A) 35.3km/hr
B) 42km/hr
C) 48.9km/hr
D) 52.6km/hr
E) 27.6km/hr
Total distance traveled = 100+200+300+100= 
<gadget id="calculator">100+200+300+100</gadget>
<output>700</output>
700km   Total time taken= 100/60 + 200/20 + 300/100 + 100/50 = 16.67 hrs   Average speed = 700/16.67 = 42km/hr approximately ;   Answer is 42km/hr
<result>B</result>
A man travels 100km by train at 60km/hr, 200km by ship at 20km/hr, 300km by aeroplane at 100km/hr and 100km by car at 50km/hr. What is the average speed for the entire distance?