Question

How many times do hands of a clock make a right angle with each other between 4pm and 10pm?


A) 11
B) 12
C) 6
D) 5​

Answer 1

Answer:

11 times

Step-by-step explanation:

Two right angles are formed during each hourly period 4-5, 5-6, 6-7, 7-8, 8-9.

However, when the clock reaches 9pm, this coincides with the second 90° between the hours of 8-9. The clock has then to reach approximately 9.34pm for the only occasion when the hands will be at 90° in the hour 9-10.

Answer 2

11 times
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