Discussion
A car is running at a speed of 90 kmph. What distance will it cover in 15 second?
Answer: C
Convert to metres per second with the factor \( \tfrac{5}{18} \).
\[ 90 \text{ kmph} = 90 \times \frac{5}{18} = 25 \text{ m/s} \]
\[ \text{distance} = 25 \times 15 = 375 \text{ m} \]
The data are complete, so "cannot be determined" is a trap. Working in kilometres and hours would need \( 15 \) s \( = \tfrac{1}{240} \) h, giving 0.375 km - the same answer.
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