comal berkeley

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#### 167 widgets
A triangle has sides in the ratio 3:4:5. If the perimeter is 60 cm, what are the lengths of the sides?
Let the sides be \( 3x \), \( 4x \), and \( 5x \). The perimeter is:
3x + 4x + 5x = 60 \\
12x = 60 \\
x = 5
The side lengths are \( 3x = 15 \), \( 4x = 20 \), and \( 5x = 25 \).
#### 15 cm, 20 cm, 25 cm
A train travels 180 km in 3 hours and then another 240 km in 4 hours. What is the average speed for the entire journey?
Total distance = \( 180 + 240 = 420 \) km