Mathematics
NULL
Medium
Question
A train covers 10 km in 12 minutes. If its speed falls by 5 km/h, how long will the same distance take?
A
10 min
B
11 min 20 sec
C
13 min
D
13 min 20 sec
✓ Official correct answer
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
10 min
No member explanations yet for this option.
B
11 min 20 sec
No member explanations yet for this option.
C
13 min
No member explanations yet for this option.
D
13 min 20 sec
No member explanations yet for this option.
Explanation
Original speed = 10 / (12/60) = 50 km/h. New speed = 45 km/h. Time = 10/45 hour = 200/9 minutes = 13 min 20 sec.