Aptitude - Races and Games - Discussion

Discussion Forum : Races and Games - General Questions (Q.No. 11)
11.
In a 300 m race A beats B by 22.5 m or 6 seconds. B's time over the course is:
86 sec
80 sec
76 sec
None of these
Answer: Option
Explanation:

B runs 45 m in 6 sec.
2

B covers 300 m in 6 x 2 x 300 sec = 80 sec.
45

Discussion:
22 comments Page 1 of 3.

Keerthika senthur said:   3 months ago
a beats b by 22.5 m. 6 seconds
So A covered 300m before B
So, 300/22.5 = 13.333.
Now 13.333 * 6 = 80.

AKSHAY WADITKE said:   4 years ago
22.5 - 6 sec.
225 - 60 sec.
Then, 300 - 225 = 75
75/6 = 12.5 sec
60 + 12.5= 72.5 sec.

Tanmaya pradhan said:   5 years ago
22.5m = 6s.
1m = 6s÷22.5m = 60÷225 = 2÷45.
300m = (2÷45)x300 = 80s.

Nancy said:   5 years ago
How 45/2 comes?
(1)

Nimu said:   5 years ago
86 is the right answer.
(1)

Gopi said:   6 years ago
I agree @Ramya.

80 sec for A to cover 300m since A beats B by 6 sec. 6 sec should add to 80 sec. Therefore 86 sec should be the answer.

VENKATESHBABU said:   6 years ago
Using chain rule:

22.5 ---- 6
300 ---- ?
300/22.5*6 = 80.

If we want A 80-6 = 72.

Dileeo said:   7 years ago
First of all, everyone having doubt of why 45/2 m/s speed is added to B why not A?

Answer is after race completion B takes that additional 6 sec to complete the race from given data we can find B speed and time

22.5 mts - 6 sec then 300 mts - 80sec it will take to complete 300 mts race here ' -' symbol is equal to.

Ravi Pudinawala said:   8 years ago
Very good explanation @Vyshu.

Vyshu.. said:   8 years ago
Let's the solution is that:-.

6 * (1/22.5) * 300 = 80.
Therefore, 80 sec is the answer.


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