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 4000m race? Pick:
A) 500
B) 700
C) 400
D) 600
E) 800
then 960/B -1000/A = 19 =&gt; 24/B - 25/A = 19/40   and 1000/B - 960/A = 30 =&gt; 25/B - 24/A = 30/40   solving equation A speed =8 and B=20/3   for 1000m b will take 4000/20/3= 600 sec   600
<result>D</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 4000m race?