It takes 10 workers 24 hours to do a job. fill in the chart.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

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21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?