Question

write the time in which angle made by hour and minute hand in exactly 90 degree​

Answer 1

Answer:

If you switch to a rotating coordinate system in which the hour hand stands still, then the minute hand makes only 11 revolutions, and so it is at right angles with the hour hand 22 times. In a 24 hour day you get 2×22=44. More mathematically, it can be done as : The minute hand moves 360 degrees in 60 minutes

Answer 2

At 3. 00 'O Clock, At 9.00 O' clock