A cyclist rides at a speed of 30 km/h and covers a distance of 90 km. Then, he increases his speed by 20% and covers another 60 km. What is the total time taken for the journey?
Show answer & explanation
Correct answer: A
Explanation
Given:
Initial speed = 30 km/h
First distance = 90 km
Speed increase = 20%
Second distance = 60 km
Formula:
Time = Distance / Speed
First part time = 90 / 30 = 3 hours
New speed = 30 × 1.20 = 36 km/h
Second part time = 60 / 36 = 5/3 hours = 1 hour 40 minutes
Total time = 3 hours + 1 hour 40 minutes = 4 hours 40 minutes