How many times are the hour hand and the minute hand of a clock of a right angles during their motion from 1:00 pm to 10:00 pm?

Question: How many times are the hour hand and the minute hand of a clock of a right angles during their motion from 1:00 pm to 10:00 pm?

A. 9
B. 10
C. 16 ✓
D. 20

Correct Answer: C. 16

Explanation: How many times are the hour hand and the minute hand of a clock of a right angles during their motion from 1:00 pm to 10:00 pm?16

In a factory, a group of 24 workers working 7 hours a day can produce 4000 units in 30 days. In how many days will 30 workers produce 3500 units by working 8 hours a day?

If the length and breadth of a square are increased by 30% and 20% respectively, the area of the rectangle so formed exceeds the area of the square by:

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