Question 886637
A man walks a certain distance with certain speed. If he walks a1/2 km an hour faster, he takes 1 hour less. But, if he walks a1 km an hour slower, he takes 3 more hours. Find the distance covered by the man and his original rate of walking.
<pre>
Distance covered: {{{highlight_green(highlight_green(36))}}} km
Original speed:    {{{highlight_green(highlight_green(4))}}} km/h
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