Two cyclists, M and N, start from the same point on a 1500 m circular track, cycling in opposite directions. M cycles at 18 km/hr and N at 22 km/hr. How long (in seconds) will it take for them to meet?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 135.
Distance = 1500 m = 1.5 km
Relative speed = 18 + 22 = 40 km/hr
Time (hours) = 1.5 ÷ 40 = 3/80 hours
Time (seconds) = 3/80 × 3600 = 135 seconds