If a man travels at 12 km per hour instead of 9 km per hour and travels 10 km more in the same time, what is the total distance traveled at the higher speed?
- 30 km
- 36 km
- 40 km
- None of these
Explanation
Distance is directly proportional to speed when time is constant (12 : 9 = 4 : 3).
Solving the ratio gives the original distance as 30 km, so the increased distance is 30 + 10 = 40 km.
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