Question

57. In a race, Rahul touches the finish line in
30 seconds and beats Kunal by 10 seconds.
If Rahul gives a start of 5 seconds to Kunal,
then in how much time will he again beat
Kunal in the race?
(A) 15 seconds (B) 30 seconds >
(C) 25 seconds (D) 5 seconds
1
79
how many​

Answer 1

hey i dont understand the qustion pa

Answer 2

Given :- In a race, Rahul touches the finish line in 30 seconds and beats Kunal by 10 seconds. If Rahul gives a start of 5 seconds to Kunal, then in how much time will he again beat Kunal in the race ?

(A) 15 seconds

(B) 30 seconds

(C) 25 seconds

(D) 5 seconds

Solution :-

we know that,

• A beats B by t seconds :- This statement implies that while A reached the winning point, B is behind A . Or, we can say that, B completes the race s seconds after A time..
• A can give B a start of s seconds :- This statement implies that A will start t minutes after B starts from the starting point. Both A and B will reach the finishing point at the same time.

So,

given that,

→ Rahul finish the race in = 30 seconds.

and, rahul beat kunal by 10 seconds. that means, kunal will finish the race after 10 seconds.

Than,

→ Rahul completes the race in = 30 + 10 = 40 seconds.

Now, given that, Rahul gives a start of 5 seconds to Kunal.

So,

• we can conclude that Rahul will start the race 5 seconds after kunal.

and,

→ Rahul completes the race in = 30 seconds.

than,

→ total time taken by rahul to finish the race = 30 + 5 = 35 seconds.

Also,

→ Kunal can finish the race in = 40 seconds.

Therefore,

→ This time, rahul beats kunal by = 40 - 35 = 5 seconds. (Ans.) (Option D).

Hence, He again beats kunal by 5 seconds in the race.

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