In a kilometer race, A beats B by 50 meters or 10 seconds. What time does A take to complete the race?

200 sec

210 sec

150 sec

190 sec

Track length = 1 km

Formula used:

Distance Speed x Time

Calculation:

"A" beats "B" by 50 m or 10 sec, means "B" covers 50 m in 10 sec

Speed of "B" = 50/10 = 5 m/s

Time to cover 1000 m = 1000/5 = 200 sec

"A" beats "B" by 10 sec means

"A" reach 10 sec early

Time taken by "A" to complete the race = 200 - 10 = 190 sec

∴ Time taken by "A" to complete the race is 190 sec.