In 1 km linear race, P beats Q by 120 metres or 30 sec. What is the time taken by P to cover the race?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 220 sec.
Speed = Distance/Time
Since Q takes 30 seconds to cover 120 meters
Speed of Q = 120/30 = 4 m/sec
Now, time taken by Q to cover 1000 meters = 1000/4 = 250 seconds
Time taken by P to cover 1000 meters = 250 - 30 = 220 seconds