Puzzle 649
A large freshwater reservoir has two types of drainage system. Small pipes and large pipes.
6 large pipes, on their own, can drain the reservoir in 12 hours.
6 small pipes, on their own, can drain the reservoir in 18 hours.
How long will 6 large pipes and 6 small pipes take to drain the reservoir?
Puzzle Copyright © Kevin Stone
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Puzzle 650
What well known saying is this:
lla ta devol evah ot reven naht tsol dna devol evah ot retteb sit
Puzzle Copyright © Kevin Stone
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Puzzle 651
Starting in the bottom left corner and moving either up or right, adding up the numbers along the way, what is the largest sum that can be made?
| 2 | 3 | 5 | 4 | 1 |
| 3 | 2 | 4 | 3 | 4 |
| 5 | 1 | 3 | 5 | 2 |
| 3 | 3 | 2 | 3 | 1 |
| 1 | 4 | 2 | 4 | 4 |
Note: this puzzle is not interactive, and the numbers cannot be clicked.
Puzzle Copyright © Kevin Stone
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Puzzle 652
If York is 9 miles away, London is 14 miles and Manchester is 23 miles away.
How far away is Leeds?
Puzzle Copyright © Kevin Stone
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