A cyclist rides at a speed of 12 m/s for 15 s, and then at a speed of 8 m/s for 25 s. Which calculation gives the average speed of the cyclist in m/s\text{m/s}m/s?
12+82\frac{12 + 8}{2}212+8
(12×15)+(8×25)40\frac{(12 \times 15) + (8 \times 25)}{40}40(12×15)+(8×25)
(12÷15)+(8÷25)40\frac{(12 \div 15) + (8 \div 25)}{40}40(12÷15)+(8÷25)
(15÷12)+(25÷8)40\frac{(15 \div 12) + (25 \div 8)}{40}40(15÷12)+(25÷8)
204 exam-style questions on CIE IGCSE Physics Motion, covering Motion. Each one has a worked solution and a mark scheme showing where the marks go.