This GMAT Math practice question is a rates question. Concept: Finding time travelled at a particular speed. Covers basics of mixtures and weighted average.
- 2 hours 30 minutes
- 3 hours
- 2 hours
- 1 hour 45 minutes
- None of these
Explanatory AnswerVideo explanation will be added soon
Let Jane travel 'x' at 60 miles per hour.
As the total time taken to cover 340 miles is 5 hours, Jane would have traveled (5 - x) hours at 80 miles per hour.
Distance covered at 60 miles per hour = Speed * time = 60 * x = 60x miles.
Distance covered at 80 miles per hour = Speed * time = 80 (5 - x) = 400 - 80x miles.
Total distance covered = Distance covered at 60 miles per hour + Distance covered at 80 miles per hour.
Therefore, total distance = 60x + 400 - 80x.
Total distance travelled = 340 miles.
Therefore, 340 = 60x + 400 - 80x
20x = 60 or x = 3 hours.
Choice B is the correct answer.