On a bicycle 5

Klára left Hořické náměstí on her bicycle and rode to Hradec Králové at an average speed of 20 km/h. Jenda left the same square on his bicycle 15 minutes after Klára left and moved in the same direction as Klára at an average speed of 30 km/h. How long did it take Jenda to catch up with Klára?

Correct answer:

t =  45 min

Step-by-step explanation:

v1=20 km/h v2=30 km/h Δt=15 min h=15:60  h=0.25 h  s1=s2  v1 x=v2 (xΔt) 20 x=30 (x0.25)  10x=7.5  x=107.5=0.75  x=43=0.75  t=x min=x 60  min=0.75 60  min=45 min=45 min



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