Last night two dogs in the neighborhood were barking. Rex b…
Last night two dogs in the neighborhood were barking. Rex barked every 21 minutes and Scruffy barked every 9 minutes. a. Rex and Scruffy began with a simultaneous bark at 2:15 am, how many minutes passed until they barked together again? b. Rex and Scruffy began with a simultaneous bark at 2:15 am, what TIME did they bark together again?