Jasper Eng's answer to Peggy's Secondary 1 Maths Singapore question.
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For 100% speed, consider time taken to be x
At 130% speed,
Time taken =
100%/ 130% * x = 10/13 x
Time decrease =
Time difference/ original time * 100%
(x - ( 10/13 ) x )/ x * 100%
= 3/13 * 100%
= 23.1% (3SF / 1 Digit)
NOT 30%
For 100% speed, consider time taken to be x
At 130% speed,
Time taken =
100%/ 130% * x = 10/13 x
Time decrease =
Time difference/ original time * 100%
(x - ( 10/13 ) x )/ x * 100%
= 3/13 * 100%
= 23.1% (3SF / 1 Digit)
NOT 30%
Date Posted:
3 years ago
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