Question

How many times an hour hand and a minute hand of a clock at right angles during their motion from 1pm to 10pm?

Answer 1

1:20 , 1:55, 2:15 , 2:30 , 3:00, 3:30
4:05, 4:35, 5:10, 5:40, 6:15 , 6:45,
7:20, 7:50, 8:30 , 9:00
9:30,
17 times minute hand and hour hand is at right angle

Answer 2

Answer:

16

Step-by-step explanation:

Between 1pm-2pm=2 times, 2pm-3pm=2times, at 3pm, 3pm-4pm = no right angle, 4pm-5pm=2times, 5pm-6pm=2 times, 6pm-7pm=2 times, 7pm-8pm=2 times, 8pm-9pm=2 times, at 9pm, 9pm-10pm= no right angle.