John covers a distance of 8km in 50 minutes. If he covers 3km distance in 2/5th of time then, What speed should he maintain to cover the remaining distance in the remaining time?  Choose the correct choice from the following options.
A) 10 Kmph
B) 15 Kmph
C) 17 Kmph
D) 18 Kmph
E) 19 Kmph
Total distance = 8 Km   Total time = 50 Km   Time taken to cover the distance of 3 Km = 50*2/5= 
<gadget id="calculator">50*2/5</gadget>
<output>20</output>
20 min= 1/3 hours   Remaining distance = 8 - 3= 
<gadget id="calculator">8 - 3</gadget>
<output>5</output>
5 Km   Required speed= 5/1/3 = 15 Kmph   15 Kmph)
<result>B</result>
John covers a distance of 8km in 50 minutes. If he covers 3km distance in 2/5th of time then, What speed should he maintain to cover the remaining distance in the remaining time?