In a race of 1 km A beats B by 140m or 14 seconds. Find the time taken by A to run 1 km?
Answer & explanation
Correct answer: option 4
Distance = Speed × Time
A beats B by 140 m in 14 second , that means B covers 140 m in 14 sec .
Speed of B = \(\frac{140}{14}\) = 10 m/s
Time to cover 1000 m = 100 sec
A beats B by 14 sec means A reach 14 sec early.
So, time taken by A to cover to cover 1000 m = 100 - 14 = 86 sec .
Time taken by a to complete the race is 86 sec .