A can give B a start of 50 metres or 10 seconds in a kilometer race. How long does A take to complete the race?	Choose one:	A) 200 seconds	B) 140 seconds	C) 220 seconds	D) 190 seconds	E) None
Solution:   A can give B a start of 50 metres or 10 seconds in a 1000 m race.   That is, B takes 10 seconds to run 50 metres.   Therefore, B will take  (10/50) * 1000= 
<gadget id="calculator"> (10/50) * 1000</gadget>
<output>200</output>
200 seconds to run 1000 metres.   A who can give B a start of 10 seconds will take 10 seconds lesser to run the 1000m.   Hence, the time taken by A= 190 seconds.   Answer 190 seconds
<result>D</result>
A can give B a start of 50 metres or 10 seconds in a kilometer race. How long does A take to complete the race?