A train travels 290 km in 4.5 hours and 400 km in 5.5 hours.find the average speed of train.  Choose the correct choice from the following:
A) 80 kmph
B) 69 kmph
C) 70 kmph
D) 90 kmph
E) None of these
As we know that Speed = Distance / Time   for average speed = Total Distance / Total Time Taken   Thus, Total Distance = 290 + 400= 
<gadget id="calculator">290 + 400</gadget>
<output>690</output>
690 km   Thus, Total Speed= 10 hrs   or,Average Speed = 690/10   or, 69 kmph.   ANSWER:69 kmph
<result>B</result>
A train travels 290 km in 4.5 hours and 400 km in 5.5 hours.find the average speed of train.