Skiing and sledding

Behind the pond, the cat Miki is skiing and Bobo is sledding down a 300-meter-long slope. Careful Bobo can go down the slope in one minute. How many km/h faster does Miki go down the hill than Bobo if he is down 20 seconds earlier?

Correct answer:

v =  9 km/h

Step-by-step explanation:

s=300 m t1=1 min s=1 60  s=60 s  Δ=20 s t2=t1Δ=6020=40 s  v1=s/t1=300/60=5 m/s v2=s/t2=300/40=215=7.5 m/s  v3=v2v1=7.55=25=2.5 m/s  v=v3 km/h=v3 3.6  km/h=2.5 3.6  km/h=9 km/h=9 km/h



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