High score for six math problems, urgent, 6th grade

The title doesn't seem to say which of A and B is in front and which is in the back?

Here's what I did under the condition that A is behind and B is first. Other conditions are similar!

Solution: When A catches up with B, B actually walks for x seconds.

Then there is: 7*(x-5)=5x+100

Easy to obtain: x = 135 2

Since 135 2> (20+5)*2

Description B made 2 stopovers.

The total time is: x+2*5=135 2+10=155 2 In summary: It takes 155 2 seconds for A to catch up with B.

Time per 100m run: 100 7 5

Running 100 meters averages 100 per second and dividing the time by 100 7 5 gives you 140 27 meters per second.

Similarly B 100 20 5 4

A is 100 meters away from B, so A stops for 5 seconds more than B, and the actual distance between A and 125125 is 105 seconds.

50 (seconds).

Approximately equal to 3 approximately equal to 2

55 (seconds).

50 (seconds).

Approximately equal to 3 approximately equal to 2

55 (seconds) This answer should be correct!

Catch-up time = distance between distances and speed difference.

50 (seconds) is approximately equal to 3

It's about 255 (seconds) and I'm in sixth grade.

What is written, go to hang up, it's all wrong, how to answer?

1. 2006 2007 2008=(2007-1) 2008 2007=2008-2008 2007=With scores, write it yourself.

36 9 37=(37-1) 9 37=9-9 37=With fractions, write it yourself.

2. Columnar calculation.

1.A number of 2 3 is 64, find this number?

2.The 1 5 of a number is 4 5 less than his 25, what is this number?

1/5x+45=1/4x, x=900

What 9 times the product with 3 12 is the reciprocal of 2 9?

9(3+x)=

4.The sum of the smallest prime number and his reciprocal is equal to the 2 5 of a number, find this number?

With the sum of 1 8 and dividing by theirs, what is the quotient? (Note that there is a gap between the division and the usual division in the question, pay attention!) ）

How many fractions of a kilogram is more than 40 kilograms?

Ask for extra points......

Uh, uh, uh. This, 10 points is not worth it, it is really not worth it, it should be 100 points!

...Shame, I'd say I'm in the sixth grade of high school. t t

Oh my God, is this still a 6th grade topic?!!

Solution: 1 (m3 5) = 3 5m (hours).

A: It takes 3 5m to travel 1 km.