Nieminen has to travel a distance of (185/2)km at 90km/hr = 1.02777 hours to go.
If your statement means that Mäkinen also drove halfway before stopping, then they took 1.3214 hours, so they have to drive 185/2 km in 2*1.02777-1.3214 = 0.734 hours, or 126 km/hr.
On the other hand, maybe you meant that both took a break at the same time, when Mäkinen had not yet gone halfway. Adjust the needed speed in that case.
b) Two families Mäkinen* and Nieminen* travel by cars a distance of 185 km. In the middle of the
travel both have a break of 20 min. During driving family Nieminen has an average speed of 90 km/h.
Family Mäkinen drives the first part at an average speed of 70 km/h. What average speed would
family Mäkinen need for the rest of the travel in order to get to the destination at the same time with
family Nieminen.
* Mäkinen and Nieminen are examples of two very common Finnish family names.
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