Mathematics
NULL
Medium
Question
Trains 140 m and 120 m run the same way at 40 and 60 km/h. How long for the faster to pass the slower?
A
0.60 minutes
B
0.36 minutes
C
0.78 minutes
✓ Official correct answer
D
0.42 minutes
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
0.60 minutes
No member explanations yet for this option.
B
0.36 minutes
No member explanations yet for this option.
C
0.78 minutes
No member explanations yet for this option.
D
0.42 minutes
No member explanations yet for this option.
Explanation
Relative speed 20 km/h; time for 260 m ≈ 0.78 minutes.