Savitha and Parnika decided to run a 2250 m long race on a track as long as the length of the race. But Savitha gave Parnika a 396 m head start and also allowed her to start 9 seconds before Savitha started running. Parnika ran at 6 m per second and Savitha caught up with Parnika 250 seconds after Savitha started running. What was Savitha's speed (in m/s) during the race?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 7.8.
Parnika's running time = 250 + 9 = 259 sec
Parnika's distance covered = 6 × 259 = 1554 m
Parnika's total distance from the starting line = 396 + 1554 = 1950 m
Savitha's distance = 1950 m
Savitha's speed = 1950/250 = 7.8 m/s
Therefore, Savitha's speed during the race was 7.8 m/s.