a) 200 sec
b) 205 sec
c) 210 sec
d) 250 sec
Answer: b
Explanation: In a km race, suppose A takes t sec,
Then, B takes (t + 30) sec, and C takes (t + 45) sec
180 m is covered by C in 45 sec
1000 m is covered by C in
= $$\left( {\frac{{45}}{{180}} \times 1000} \right)$$ sec
= 250 sec
A covers 1000 m in
= (250 – 45) sec
= 205 sec
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