Answer :
Using the concept of proportional relationship, the time taken by Evian, Toby and J are 10, 9 and 12 minutes respectively.
Using the concept of proportional relationship :
For Evian :
1.5 miles = 15 minutes
1 mile = x
1.5x = 15
x = 15 / 1.5
x = 10 minutes
For Toby :
2/3 miles = 6 minutes
1 mile = x
2/3x = 6
x = 6 ÷ 2/3
x = 9 minutes
For J :
0.75 miles = 9 minutes
1 mile = x
0.75x = 9
x = 9 / 0.75
x = 12 minutes
Therefore, the time taken by Evian, Toby and J are 10, 9 and 12 minutes respectively.
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