Walker A takes 3 hours more than B in walking 30 km. If A doubles his speed, he will take 2 h less than walker B. Find the speeds of walkers A and B .

Correct answer:

v1 =  3 km/h
v2 =  4.2857 km/h

Step-by-step explanation:

t1 = 3h + t2 s=30 km  t3 = t22h  s = vt  s = v1 t1 = v2 t2 s = 2 v1 t3  s = v1 (3+t2) s = v2 t2 s = 2 v1 (t22)  t2=7 h  t1=3+t2=3+7=10 h t3=t22=72=5 h v1=s/t1=30/10=3 km/h
v2=s/t2=30/7=4.2857 km/h

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