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. 1.23.

105 mi/h 30 min Fig. 1.23 70 mi/h