Mathematics · Speed, Time and Distance
Kanishka leaves for work every day and reaches exactly on time when she drives at her usual speed of 36 km/h. If one day she drives at 30 km/h, she arrives 12 minutes late. One morning, she covers three-quarters of the distance to her office in half of her usual travel time, then stops for 10 minutes. By what percentage should she change her speed (increase or decrease) compared to the speed at which she was driving before the stop, so that she arrives exactly on time?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Decrease by 100%
- 2Increase by 100%
- 3Decrease by 50%✓
- 4Increase by 50%
Correct answer
Decrease by 50%
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