- In a kilometre race, A can give B a start of 100 m or 15 seconds. How
long does A take to complete the race?
(1) 150 seconds (2) 165 seconds (3) 135 seconds (4) 66.67 seconds
Solution:
In a 1000 metre race A gives B a start of 100 m or 15 seconds.
This essentially means that B takes 15 seconds to run 100 m.
Therefore, B will take 150 seconds to run the stretch of 1000 metres. (1000 m =
10 times 100 m and therefore the time taken will also be 10 times 15 seconds =
150 seconds).
As A takes 15 seconds less than B, he will take 135 seconds to run the 1000 m.
