In a race of 1 km A beats B by 170m or 17 seconds. Find the time taken by A to run 1 km?
Answer & explanation
Correct answer: option 3
Distance = Speed × Time
A beats B by 170 m in 17 second , that means B covers 140 m in 14 sec .
Speed of B = \(\frac{170}{17}\) = 10 m/s
Time to cover 1000 m = 100 sec
A beats B by 17 sec means A reach 17 sec early.
So, time taken by A to cover to cover 1000 m = 100 - 17 = 83 sec .
Time taken by a to complete the race is 83 sec .