15.
[tex] \frac{5040 \: words}{1 \: \cancel{hour}} \times \frac{1 \: \: \cancel{hour}}{60 \: minutes} = \frac{84 \: words}{minute} [/tex]
16.
use distance, speed, time formula
d = st
where
d = 135 km
s = 45 km/h
t = ?
solve for t,
t = d/s
t = 135/45
t = 3 hours
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