Question

In a kilometer race,a can givebb a start of 100m or 15 seconds.How long does a take to complete the race?

Answer 1

Answer

2min 30 sec

Answer 2

Answer:

135 Seconds

Step-by-step explanation:

Suppose , A completes the race in X Seconds, B completes in Y seconds & Race has 1000 m track.

If A can give B a start of 100m & still win,

X-(900/1000)*Y<=0

hence, X<=0.9Y

If A can give B a start of 15 Seconds & still win,

X-(Y-15)<0

hence, X<= Y-15

0.9Y= Y-15

0.1Y=15

Y=150 Seconds

X=135 Seconds