An algebra problem by Donald Kuok

Algebra Level pending

A fly, moving at 40 mph, zigzags back and forth between two trains, each moving at 20 mph. If the trains are 100 miles apart initially, how much distance (in miles) will the fly travel?


The answer is 100.

Donald Kuok by Donald Kuok , 47, Singapore

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1 solution

Donald Kuok
Dec 17, 2016

Now, the trains take one hour to collide (their relative speed is 20 mph and they are 100mph apart initially). Since the fly is traveling at 40mph and flies continuously until it is squashed (which it is to be supposed occurs a split second before the two oncoming trains squash one another), it must therefore travel 100mph in the hour's time.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Hi Donald,

We make edits to incoming problems to upkeep a minimum level of quality. For example, titles should be relevant to the problem statement. In your case, the title of "98% OF PEOPLE CAN'T SEE THE TRICK OF THIS SUM!!!" is clickbait, disrespectful and irrelevant. As such, we removed it.

Calvin Lin Staff - 4 years, 5 months ago

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