Question

In a kilometre race, A beats B by 30 seconds and B beats C by 15 seconds. If A beats C by 180 metres, the time taken by A to run 1 kilometre is what ?​

Answer 1

Answer:

A beats B by 30 seconds, B beats C by 15 seconds

Therefore, A beats C by (30 + 15) seconds = 35 seconds.

=> Time taken by C to travel 180 m = 45 seconds.

=> Time taken by C to cover the distance of 1 km (1000 m) = 45/180 × 1000 = 250 seconds.

Therefore, required time taken by A to cover the distance of 1 km = (250 – 45) sec = 205 sec.

Answer 2

Answer:

Step-by-step 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

= (45180×1000)

  sec

= 250 sec

∴ A covers 1000 m in

= (250 - 45) sec

= 205 sec