a:
[tex] \frac{25}{19} = \frac{x}{1} \\ 19x = 25 \\ x = \frac{25}{19} [/tex]
he can swim 25/19 yards per sec
b:
[tex] \frac{ \frac{25}{9} }{1} = \frac{y}{60} \\ \frac{25}{9} = \frac{y}{60} \\ 9y = 60 \times 25 \\ y = \frac{60 \times 25}{9} \\ y = \frac{1500}{9} \\ y = \frac{500}{3} [/tex]
he can swim 500/3 yards per min
