Questions:

1. Bob wants to jump so that he reaches the ground in 20 seconds. To do this, at what altitude should Bob jump?
   
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2. Betty and Bob want to select their jump altitudes so that Bob reaches the ground 5 seconds before Betty. If Betty jumps at an altitude of 7000 feet, at what altitude should Bob jump?
   
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3. Next time when they jump simultaneously, Bob jumps at 7000 feet and Betty at 5000 feet. At what times will each reach the ground?
   
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4. Betty and Bob have decided that their next jump will be with parachutes. They jump simultaneously, with Bob jumping at 7000 feet and Betty at 5000 feet. At what times will each reach the ground?
   
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5. Assume that Betty and Bob want to reach the ground at the same time, but start at 5000 feet and 7000 feet, respectively. How many seconds ahead of Betty will Bob need to jump?
   
   Answer

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