A train covers 100 km at a speed of 50 km/h. Due to track repair, it reduces speed by 40% for the next 60 km. What is the total time taken for the full journey?
Show answer & explanation
Correct answer: B
Explanation
Given:
First distance = 100 km
First speed = 50 km/h
Second distance = 60 km
Speed reduction = 40%
Time for the first part = 100 / 50 = 2 hours
New speed = 50 × (1 − 40/100) = 30 km/h
Time for the second part = 60 / 30 = 2 hours
Total time = 2 + 2 = 4 hours