n a 1000m race, if A gives B a start of 40m, A wing by 19sec. But if A gives B start of 30sec, B wins by 40m.
Find the time taken by B to run 2000m race?  Select
A) 300 B) 250 C) 400 D) 450 E) 500
then 960/250 -1000/A = 19 =&gt; 24/250 - 25/A = 19/40   and 1000/250 - 960/A = 30 =&gt; 25/250 - 24/A = 30/40   solving equation A speed =8 and 250=20/3   for 1000m b will take 2000/20/3= 250 sec   250
<result>B</result>
n a 1000m race, if A gives B a start of 40m, A wing by 19sec. But if A gives B start of 30sec, B wins by 40m.
Find the time taken by B to run 2000m race?