The tourist

The tourist traveled 78km in 3 hours. Part of the journey went on foot at 6km/h, the rest of the trip by bus at 30km/h. How long did he walk?

Correct result:

t1 =  0.5 h

Solution:

s=78 km t=3 h v1=6 km/h v2=30 km/h  s=s1+s2 s=v1 t1+v2 (tt1)    s=v1 t1+v2 (tt1) 78=6 t1+30 (3t1)  24t1=12  t1=12=0.5=12 h=0.5 h  t2=tt1=30.5=52=2.5 h s1=v1 t1=6 0.5=3 km s2=v2 t2=30 2.5=75 km



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