Multiple choice

A student riding a bicycle on a 5-km one-way street takes 40 minutes to reach home. The student stopped for 15 minutes during this ride. 60 vehicles overtook the student (assume the number of vehicles overtaken by the student is zero) during the ride and 45 vehicles while the student stopped. The speed of vehicle stream on that road (in km/hr) is

  1. 7.5

  2. 12

  3. 40

  4. 60
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The student travels 5 km in 40 - 15 = 25 minutes (5/12 hours). Speed of student = 5 / (5/12) = 12 km/hr. Relative speed logic: The number of overtakes depends on the speed difference. With 60 overtakes in 25 minutes, the vehicle stream speed is 60 km/hr.

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