Pedestrian and the cyclist

Pedestrians and cyclists went against each from the two cities that are distant 40 km. The pedestrian started 30 minutes before the cyclist and walked at an average speed of 5 km/h. What speed went the cyclist when met after 120 minutes from the start of the pedestrian?

Correct answer:

v =  0 km/h

Step-by-step explanation:

The system of equations is non-linear.
The equations have the following integer solutions:
60 * (a ) = 60 * ( 5*(120/60) )
60 * (b ) = 60 * ( v((120-30)/60) )

Number of solutions found: 1
a1=10, b1=30, v1=20

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