The dog is chasing the rabbit. The rabbit is 150 feet ahead of the dog. It is known that the dog jumps 9 feet at a time and the rabbit hops 7 feet at a time. How many times does it take the dog to catch up with the rabbit?
狗追兔，兔在狗前面150英尺，已知狗跳一次9英尺，兔跳一次7英尺，问狗跳多少次才能追上兔？
<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">150 / 2</gadget>
<output>75</output>

<result>75</result>