Paul and Honza
Honza went to chat on a bike without a break 4.0 hours. Paul the same way without breaks 50 minutes longer. The difference between the speeds of the two boys was the one kilometer per hour. How fast was Paul, if you know that the speed of the boys did not change during the journey?
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solve equations by substitution: x+y= 11 y=5x-25
Number 118 divide into two addends, so first addend is 69 greater than 75% of the second addend.