# Cyclist

A cyclist is moving at 35 km/h and follow pedestrian who is walking at speed 4 km/h. Walker has an advantage 19 km. How long take cyclist to catch up with him?

Correct result:

t =  0.61 h

#### Solution:

$s_1 = s_2 \ \\ v_1 t = 19 + v_2 t \ \\ t = \dfrac { 19 } { v_1 - v_2 } = \dfrac { 19 } { 35 - 4 } = 0.61 \ \text{h}$

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