In 10 minutes a heart can beat 700 times. At what rate can a heart beat?

Heartbeats at a rate of 70 beats per minute.

Explanation:

In 10 minutes heart beats 700 times

hence in 1 minute it will beat 700 : 10=70 times

Heart will beat 140 times in 2 minutes.

Heart beats at a rate of 70 beats per minute.

(How it's done down below)

In 0 minutes heart beats 700 times

hence in 1 minute it will beat 700/10 = 70 times

and heart will beat 140 times in 140/70 = 2 minutes