In 2 hours, 1 student can paint 4 large signs or 12 small signs. Therefore, 3 students are required to paint the large signs () and 5 students are required to paint the small signs (). In total, 8 students are required.

In the first three hours, he travels 180 miles.

In the next two hours, he travels 144 miles.

for a total of 324 miles.

Divide by the total number of hours to obtain the average traveling speed.

Tom runs a 100m race in a certain amount of time. If John runs the same race, he takes 2 seconds longer. If John ran at 8m/s, how fast did Tom run?

Letdenote the amount of time that it took Tom to run the race. Then it took Johnseconds to run the same race going 8m/s. At 8m/s, it takes 12.5 seconds to finish a 100m race. This means it took Tom 10.5 seconds to finish. Running 100m in 10.5 seconds is the same as

Jim arrived at the common destination in 70 minutes, orhours. His average speed was 54 miles per hour, so their workplace is

远离吉姆和茱莉亚的家里e.

Julia traveled those 63 miles in 80 minutes, orhours, so her average speed was

,

or, rounded, 47 miles per hour.

Andy traveled for 50 minutes, orof one hour, at 45 miles per hour, so the office building ismiles from Andy and Donna's house. Donna traveled this distance for 45 minutes, orof one hour, so her speed was:

miles per hour.

Letbe the rate at which Kenny drove. Then Marie drove at a rate ofmiles per hour. The two drove the same distance, so, since Kenny drove 70 minutes, orhours, and Marie drove for 80 minutes, orhours, we can use the formulato set up the equation:

Since Kenny traveled at 48 miles per hour forhours, the distance each drove is

miles.

Jerry drove 60 miles per hour for 4 hours - that is,miles.

He drove the remainder of the distance, ormiles over a period ofhours, so his average speed was

miles per hour.

If Sally drives q miles in 3 hours, her rate is 3/q miles per hour. Plug this rate into the distance equation and solve for the time:

We need to convert hours into minutes and multiply this by the 10 minute time interval:

If the driver needs to drive two laps, each one mile long, at an average rate of 60 miles per hour. To find the average speed, we need to add the speed for each lap together then divide by the number of laps. The equation would be as follows:

In our case we know lap one was driven atmiles per hour. We substitute this value in forand solve for.

Thus to averagemiles per hour for two laps with lap one beingmiles per hour, lap two would have to have a rate ofmiles per hour.