A boy has to cover a total distance of 300 kms. in 6 hours. He travels at the rate of 60 kmph. for first 90 minutes and next 100 kms. at the rate of 50 kmph. At what average speed must he travel now in order to complete the journey in 6 hours?
Choose the most appropriate option:
A) 24 kmph	B) 84 kmph	C) 48 kmph	D) 44 kmph	E) 14 kmph
Explanation:   The boy travels 60 kmph for 90 min, this means he travels 90 km.   Next 100 km at the rate of 50 kmph, this means he travels 100 km.   Total distance traveled till now = 100 + 90= 
<gadget id="calculator">100 + 90</gadget>
<output>190</output>
190 km   Time spent= 1.5 + 2= 
<gadget id="calculator">1.5 + 2</gadget>
<output>3.5</output>
3.5 hr   Required speed= Remaining distance/ Time   = (300 – 190) /(6 – 3.5)   = 110/ 2.5= 
<gadget id="calculator">110/ 2.5</gadget>
<output>44</output>
44 kmph\   ANSWER: 44 kmph
<result>D</result>
A boy has to cover a total distance of 300 kms. in 6 hours. He travels at the rate of 60 kmph. for first 90 minutes and next 100 kms. at the rate of 50 kmph. At what average speed must he travel now in order to complete the journey in 6 hours?