datonman wrote:The ratio between the speeds of Mary and Jerry is 7:8 while covering a distance. If Mary takes 20 mins more than Jerry, calculate the time taken by Jerry to cover the distance.
Is there truly a way to solve this by inverting the ratio in regards to time, hence, 7/8 times 8/7?
The RATE RATIO for Mary and jerry is 7:8.
Since rate and time are RECIPROCALS, the TIME RATIO for Mary and Jerry is 8:7.
Implication:
For every 8 minutes that Mary travels, Jerry travels 7 minutes.
Since 8:7 = 80:70 = 160:140, Mary travels for 160 minutes, while Jerry travels for 140 minutes, for a difference of 20 minutes.
Final Answer:
140.
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