alleryZaheeda doubles her speed on the same route. The time she takes:
ADoubles
BFalls to one third
CFalls to one half
DIs unchanged
Answer & Solution
Correct answer: C. Falls to one half
1. The route is the same, so the distance is fixed.
2. Speed and time are therefore in inverse proportion.
3. As Zaheeda doubles her speed by running, the time reduces to half.
4. Increasing her speed threefold by cycling would cut the time to one third.
5. So the factor by which speed rises is exactly the factor by which time falls.
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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