Motorcycle 17343

Karel left for the cottage at 7:00 and his parents 20 minutes later. Everyone came to the chat at the same time. Karel rode a motorcycle at a speed of 20 km/h, and his parents drove a car at 1 km per minute. How far is the cottage from where they live? When did they come to the cottage?


s =  10 km
t2 = 7:30 hh:mm Wrong answer

Step-by-step explanation:

v1=20 km/h v2=1 60=60 km/h  s1=s2  v1 t=v2 (t20/60) 20 t=60 (t20/60)  2400t=1200  t=24001200=0.5  t=21=0.5  s=v1 t=20 0.5=10 km
t2=t+7.00=0.5+7.00=215=7.5=7:30 hh:mm

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