Latest TCS Aptitude Question SOLUTION: Two ISB alumni decide to meet at Caf Linger On between 9:30 am and 10:30 am. They agree that the person who arrives first at the cafe would wait for exactly 15 minutes for the othe

• Placement Papers
• /
• TCS
• /
• Numerical Ability
• /
• Probability

TCS Question Papers: TCS Interview Experience(90) TCS Company Profile

(#M40024704) TCS Numerical Ability question Keep an EYE

Two ISB alumni decide to meet at Caf Linger On between 9:30 am and 10:30 am. They agree that the person who arrives first at the cafe would wait for exactly 15 minutes for the other. If each of them arrives at a random time between 9:30 AM and 10:30 AM. What is the probability that the meeting takes place?

a. 7/18
b. 9/16
c. 7/16
d. 11/18

Asked In TCS ashokkumar (10 years ago)

Unsolved Read Solution (9)

Is this Puzzle helpful?   (12)   (7) Submit Your Solution Probability

Read Solution (9) :

Shubhashish gaurav  (10 years ago)

9:30-9.45-10-10.15-10.30
now since A can arrive in any of the four slots and same wid B,so total sample space is 16;
now suppose A has arrived between 9.30-9.45 then if B arrives in oder 3 slots then
they dont meet and same with B if a arrives in another 3 slots
total probability that they dont meet is p(a)*P(b)=3/4*3/4 = 9/16;
now they meet is 1-9/16=7/16;

Is this solution Helpfull? Yes (24) | No (2)  

Bailore Pradyumna Acharya  (10 years ago)

7/16 is the answer....
the probability that they meet=1-prob that they don't meet
prob that they don't meet=(3/4)*(3/4)=9/16
hence prob that they meet=1-9/16=7/16

Is this solution Helpfull? Yes (18) | No (3)  

sujitha maddula  (10 years ago)

can u explain it clearly....

Is this solution Helpfull? Yes (5) | No   

Lakshmi.B  (10 years ago)

hw probability they don't meet is 3/4?
i think it is reverse of it prob they meet only 3/4.

Is this solution Helpfull? Yes (3) | No (1)  

basanagouda  (10 years ago)

both friends may meet at 9.30 or 9.45 or 10.00 or 10.15 or inbetween the two timings. so (4+3)/16=7/16.

Is this solution Helpfull? Yes (2) | No   

Mathumathi.L  (8 years ago)

ANS:7/16
There are four 15 min in one hour.
now we first calculate the probablity that they dont meet
which is
for person A=45/60=3/4
for person B=45/60=3/4
now 3/4*3/4=9/16

hence the total probablity is
1-(9/16)=7/16

Is this solution Helpfull? Yes (2) | No   

pre  (10 years ago)

@bailore:..plss explain it clearly

Is this solution Helpfull? Yes | No   

Guru Pranav  (10 years ago)

Very Nice Question !!!

Is this solution Helpfull? Yes | No   

PRIYA TJ  (9 years ago)

why 3/4 is two times multiplied?

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.