Autoroad builders do 4 km of the road in a week. Kogda length of the road reached 76 km, the constructed part of the road began to be marked. In how many weeks will markers catch up with autoroad builders if the speed of autoroad builders is 2/21 speeds of markers?

ANSWER: in 2 weeks. Speed of autoroad builders - 4 km in a week of =2/21 speeds of markers 1) 1/21=4:2=2км/нед 2) the 2*21=42km/week-speed of markers 3) will be made by markers in 2 weeks 4) autoroad builders in 2 weeks 5 4*2=8km-will make) autoroad builders .kak 76+8=84km-will make them before markers will catch up
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