During each minute of comedy show, Carlin laughs 5 times. Carlin watches 3 comedy shows every day, and each show is 40 minutes long. How many times does Carlin laugh every day due to the comedy shows?

during each minute, he laughs 5 times

he watches 3 comedy shows....each one being 40 minutes....so thats a total of : 3 * 40 = 120 minutes

and if he laughs 5 times per minute....120 * 5 = 600 laughs per day <==