Hint to Riddle #88: Work Rate Puzzles

88. Adam can mow a field in 1 hour, in the same time Bob can mow 2 fields, if they work together how long does it take them to mow a field?

And a generalised discussion of work-rate problems.
diagram showing three fields squished down into one The key to solving this kind of problem is to realise it's just a speed calculation. Speed is distance over time.

In Bob's case for example he can do two fields in one hour. This is no different to 2 miles in 1 hour or 2mph. Adam can do 1 field in 1 hour.

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