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02 Feb 2026, 03:26
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A
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Difficulty:
35%
(medium)
Question Stats:
75% (01:48) correct
25%
(02:11)
wrong
based on 91
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At her usual jogging speed of r kilometers per hour, Melanie burns 15 calories per minute. If she ran 10 kilometers yesterday at her usual jogging speed, how many calories did she burn while jogging yesterday?
A. 9000/r
B. 15000/r
C. 1500/r
D. 900/r
E. 150/r
A. 9000/r
B. 15000/r
C. 1500/r
D. 900/r
E. 150/r
02 Feb 2026, 07:12
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Solution:
Given : Speed = r km per hour
Distance = 10 km
Calories burnt = 15 calories per minute (900 per hour)
By applying the matrix approach we get the time
In one hour = 900 calories
\( \frac{10}{r} \)hour= \(\frac{9000}{r}\)
Hence, Option A
Given : Speed = r km per hour
Distance = 10 km
Calories burnt = 15 calories per minute (900 per hour)
By applying the matrix approach we get the time
| Speed | Time | Distance |
| r | \(\frac{10}{r}\) | 10 |
In one hour = 900 calories
\( \frac{10}{r} \)hour= \(\frac{9000}{r}\)
Hence, Option A
kevincan
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