A can run 1 km in 4 min, and B can cover the same distance in 4 min 10 sec. By what distance can A beat B in a 1 km race?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 40 m.
⇒ 1 km = 1000 m
⇒ 4 min = 4 × 60 = 240 sec
⇒ Speed of A = 1000/240 = 25/6 m/s
⇒ 4 min 10 sec = 240 + 10 = 250 sec
⇒ Speed of A = 1000/250 = 4 m/s
⇒ Difference in time = 250 - 240 = 10 sec
⇒ Distance covered by B in 10 sec = 4 × 10 = 40 m
Thus, A can beat B by 40 m.