Question

Select the watch that would record 72 beats per minute
Watch 1 : 12 beats per 20 seconds
Watch 2 : 24 beats per 20 seconds
Watch 3 : 6 beats in 12 seconds

• A. Watch 1
• B. Watch 2
• C. Watch 3
• D. All of the above

Answer 1

The correct option is B Watch 2

Given:
Watch 1 measures 12 beats per 20 seconds
In 60 seconds(one minute) watch 1 will measure = 12 X 3 = 36 beats per minute.

Watch 2: 24 beats per 20 seconds
In 60 seconds(one minute) watch 2 will measure = 24 x 3 = 72 beats
Hence,
Watch 2 is the right choice.