Asked by karem
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.
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.
Answers
Answered by
Steve
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.
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.
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