In Exercise, solve the given problems. All data are accurate to two significant digits unless greater accuracy is given.
A helicopter used in fighting a forest fire travels at 105 mi/h from the fire to a pond and 70 mi/h with water from the pond to the fire. If a round-trip takes 30 min, how long does it take from the pond to the fire? See Fig. 1.22.
Fig. 1.22
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