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• Level: GCSE
• Subject: Maths
• Word count: 2916

# Investigating distances.

Extracts from this document...

Introduction

## Introduction

A group of swimmers are following a training schedule that requires them to dive into the water and swim one length of the swimming pool. They must keep doing this until they have completed 20 lengths. For safety's sake they have been allocated a single lane of the pool and all the swimmers must swim in the same direction in single file.

Half of the swimmers say that it will be quickest always to swim in the same direction, climbing out of the pool at the end of each length to rejoin the queue. The other swimmers want to climb out of the pool at the end of each length, wait until all the simmers have completed the length and then swim back one by one in the opposite direction.

I have to pick the method that I prefer and I have chosen the one where they get out at the end of each length, wait until all the swimmers have completed the length and then swim back in the opposite direction. I have chose this way because then the swimmers don't have to

Middle

10

770

840

910

980

1050

1120

1190

1260

1330

1400

There is a delay between each length because swimmer no 1 has to wait before swimmer 10 has finishes his last length before he can start his next length. This takes quite a lot of time while he/she is waiting to do his/her next length.

The total time it took for the swimmers to complete 20 lengths swimming at a constant speed of 1ms (metres per second) and starting swimming five seconds after the last person is 1400 seconds which is 23 minutes and 20 seconds.

I will now change the variables to see what happens to the results. I will keep the length of the pool at

25 metres but make it so the swimmers are swimming at a faster pace of 2ms. Here are the results.

 Swimmer no Length 1 2 3 4 5 6 7 8 9 10 1 12.5 70 127.5 185 242.5 300 357.5 415 472.5 530 2 17.5 75 132.5 190 247.5 305 362.5 420 477.5 535 3 22.5 80 137.5 195 252.5 310 367.5 425 482.5 540 4 27.5 85 142.5 200 257.5 315 372.5 430 487.5 545 5 32.5 90 147.5 205 262.5 320 377.5 435 492.5 550 6 37.5 95 152.5 210 267.5 325 382.5 440 497.5 555 7 42.5 100 157.5 215 272.5 330 387.5 445 502.5 560 8 47.5 105 162.5 220 277.5 335 392.5 450 507.5 565 9 52.5 110 167.5 225 282.5 340 397.5 455 512.5 570 10 57.5 115 172.5 230 287.5 345 402.5 460 517.5 575

I took 575 sec for 10 people to swim 10 lengths of a pool, which are 25 metres long and swimming at a constant rate of 2ms. This is a lot less time than when they were travelling a 1ms.

These is the results of the next 10 lengths

 Swimmer No Length 11 12 13 14 15 16 17 18 19 20 1 587.5 645 702.5 760 817.5 875 932.5 990 1047.5 1105 2 592.5 650 707.5 765 822.5 880 937.5 995 1052.5 1110 3 597.5 655 712.5 770 827.5 885 942.5 1000 1057.5 1115 4 602.5 660 717.5 775 832.5 890 947.5 1005 1062.5 1120 5 607.5 665 722.5 780 837.5 895 952.5 1010 1067.5 1125 6 612.5 670 727.5 785 842.5 900 957.5 1015 1072.5 1130 7 617.5 675 732.5 790 847.5 905 962.5 1020 1077.5 1135 8 622.5 680 737.5 795 852.5 910 967.5 1025 1082.5 1140 9 627.5 685 742.5 800 857.5 915 972.5 1030 1087.5 1145 10 632.5 690 747.5 805 862.5 920 977.5 1035 1092.5 1150

Conclusion

If I had a lot more time and I was to change anything on this problem I would make the models more exact. I would find out actual swimming and walking times through testing and not just estimating. I would experiment on the average times it takes swimmers to swim 20 lengths. I would make the whole model more exact thus giving a more reliable result.

Based on the assumptions that I have made through this problem, the second method is the quickest way for the swimmers to complete 20 lengths. They walk using this method but they complete the 20 lengths in a lot less time than by using the other method.

This student written piece of work is one of many that can be found in our GCSE Comparing length of words in newspapers section.

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