Five teachers P, Q, R, S and T teach a group of students in a sequence between…
2026
Five teachers P, Q, R, S and T teach a group of students in a sequence between 9:00 am to 2:00 pm. Each teacher teaches for one hour. Q takes the first class. S teaches just after the T. R teaches before P and T. Who takes the second class from 10:00 am to 11:00 am?
- A.
P
- B.
T
- C.
S
- D.
R
Attempted by 480 students.
Show answer & explanation
Correct answer: D
Given:
Q is fixed at 9:00–10:00.
S teaches immediately after T (so T and S are a consecutive pair with T before S).
R teaches before P and before T.
Reasoning:
The slots are 9–10, 10–11, 11–12, 12–1, 1–2. With Q at 9–10, that slot is unavailable for others.
T cannot be at 10–11 because then R would need to be earlier than 10–11, and the only earlier slot is 9–10 which is already Q; so T cannot be 10–11.
Therefore T must be placed later (for example at 11–12 or 12–1) with S immediately after it. To keep R before T (and before P), R must occupy 10–11.
One consistent arrangement is: 9–10 Q, 10–11 R, 11–12 T, 12–1 S, 1–2 P, which satisfies all conditions.
Conclusion: The second class from 10:00 am to 11:00 am is taught by R.