Jasper Eng's answer to Caden's Primary 6 Maths Speed Singapore question.
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Find the difference in distance and speed, to find the additional distance travelled*
Difference in distance:
4/7 - 3/7 = 1/7
Difference in speed:
20km/hr
Time travelled: 1hr 20 min = 80 min
Hence:
In 80 min, with 20km/hr, Mary can travel 1/7 of the distance
1/7 distance:
20km/hr * 80min / 60min = 26.7km
3/7 distance:
26.7 * 3 = 80km
4/7 distance:
26.7 * 4 = 106.7km
:. Mary either travelled 80km OR 106.7km, based on her speed//
Difference in distance:
4/7 - 3/7 = 1/7
Difference in speed:
20km/hr
Time travelled: 1hr 20 min = 80 min
Hence:
In 80 min, with 20km/hr, Mary can travel 1/7 of the distance
1/7 distance:
20km/hr * 80min / 60min = 26.7km
3/7 distance:
26.7 * 3 = 80km
4/7 distance:
26.7 * 4 = 106.7km
:. Mary either travelled 80km OR 106.7km, based on her speed//
Date Posted:
3 years ago
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