Foundation
USE WHEN
Speed changes by a percentage and time/distance constraints must still hold.
BEST METHOD
Fixed Distance Inverse Method
TARGET
90–120 sec
MASTERY
not started
Speed changes by a percentage and time/distance constraints must still hold.
For fixed distance, speed and time are inversely proportional.
If speed rises x%, time falls by x/(100+x)×100%.
Treat time as inversely proportional to speed for same-distance questions.
Timed drill
Identify the base or invariant before you calculate.
Attempt first · Standard Example
Attempt first · CAT-Level Example
3-level practice ladder
Foundation
CAT Standard
Advanced / Hybrid
This pattern is a recurring CAT arithmetic archetype.