Pedestrian and the cyclist

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

Correct result:

v =  0 km/h


System of equations are 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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