Solved IB ACIO Question
A solved IB ACIO PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Clockmedium · 45s
At 9:15, what is the smaller angle between the hour and minute hands?
TopicClock
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Hour hand at (9*30 + 15*0.5) = 277.5°, minute hand at 90°, difference = 187.5°, smaller angle = 360 - 187.5 = 172.5°.
Final Answer: Option A — 172.5°