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 1000m race?
Choose the correct answer
A) 125  B) 130  C) 140  D) 150  E) 160
then 960/B -1000/125 = 19 =&gt; 24/B - 25/125 = 19/40   and 1000/B - 960/125 = 30 =&gt; 25/B - 24/125 = 30/40   solving equation 125 speed =8 and B=20/3   for 1000m b will take 1000/20/3= 125 sec   125
<result>A</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 1000m race?