The geometric mean of x+3 and 4x+1 is 2x+1. Find all possible values of x.
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The two laws of motion are
Since Mr Sim's speed is 15 km/h less that Mr Low's, we have
Note that the distance d is the same for both equations, because they traveled the same path.
20 minutes is 1/3 of a hour, so at t=1/3 Mr Low traveled the whole distance, while at the same time Mr Sim traveled 4/5 of the distance:
If we multiply Sim's equation by 5/4, we have
Since the left hand sides are equal, we equal the right hand side as well:
Multiply both sides by 12:
Expand the right hand side:
Which implies