Train

The train passes part of the line for 95 minutes at speed 75 km/h. What speed would have to go in order to shorten the driving time of 20 minutes?

Result

v =  95 km/h

Solution:

v=9595−20⋅75=95 km/hv = \dfrac{ 95} { 95-20 } \cdot 75 = 95 \ \text{km/h}

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