# Runner

Peter ran a speed of 12.4 km / h. After 45 minutes running he had a hiatus. The track is 31 km long. How many kilometers he still to run if he still running at the same speed?

Result

x =  21.7 km

#### Solution:

$v = 12.4 \ \\ t = 45/60 = \dfrac{ 3 }{ 4 } = 0.75 \ \\ s = v \cdot \ t = 12.4 \cdot \ 0.75 = \dfrac{ 93 }{ 10 } = 9.3 \ \\ x = 31 - s = 31 - 9.3 = \dfrac{ 217 }{ 10 } = 21.7 = 21.7 \ \text{ km }$

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