Question

Judy's heart beats 70 times a minute. At this rate, how many times does it beat per hour?

Answer 1

4200 beat per hour

Explanation:

70 beat per min to beat per hour

70 beat 60 min

------- x ----------- = 4200 beat per hour

min 1 hour

Answer 2

4200 times

Explanation:

`70\:times = 1\:minute\\x\:times\:= 60\:minute\\\\Cross\:multiply\\ x = 70 * 60\\\\x = 4200\\\\= 4200 \:times\:in\:an\:hour\\\\Note: 60\:minutes = 1 \:hour`