In a race of 400 m, Bhim gave Saral a head start of 20 m at the start of the race. Saral took 48 seconds to complete the race. What was the speed (in m/s) of Bhim if Saral defeated Bhim by a margin of 2 seconds?
- A8.7
- B7.6
- C7.4
- D8
Solution & Step-by-step Explanation
Total distance of the race = 400 m.
Since Bhim gives Saral a head start of 20 m, Saral only needs to cover:
Scribd
Distance covered by Saral=400−20=380 m
Saral takes 48 seconds to complete his part of the race.
Saral defeats Bhim by 2 seconds. This means Bhim took 2 seconds more than Saral's total time to complete the full race distance of 400 m.
Time taken by Bhim=48+2=50 seconds
Bhim runs the entire distance of 400 m.
Speed of Bhim=
Time taken by Bhim
Distance covered by Bhim
=
50
400
=8 m/s
Since Bhim gives Saral a head start of 20 m, Saral only needs to cover:
Scribd
Distance covered by Saral=400−20=380 m
Saral takes 48 seconds to complete his part of the race.
Saral defeats Bhim by 2 seconds. This means Bhim took 2 seconds more than Saral's total time to complete the full race distance of 400 m.
Time taken by Bhim=48+2=50 seconds
Bhim runs the entire distance of 400 m.
Speed of Bhim=
Time taken by Bhim
Distance covered by Bhim
=
50
400
=8 m/s