A hot-air balloon is 150 feet above the ground when a motorcycle passes directly beneath it (traveling in a straight line on a horizontal road). The motorcycle is traveling at 40 mph. If the balloon is rising vertically at a rate of 10 ft/sec, what is the rate of change of the distance between the balloon and the motorcycle ten seconds later?
As you know that a^2+b^2=c^2 2da/dt+2bdb/dt=2cdc/dt change the units into ft/sec or miles per hour so your da is the balloon rate, your db is the motorcycle rate.a is 150 feet, b is 40 m/h x 10 secs, just plug it in to figure out c first. then dc/dt.
