A and B take part in a 100 metres race. A runs at 5 km an hour. A gives B a start of 8 metres and still beats him by 8 seconds. The speed of B is ?
A. 4.45 km/hr
B. 4.14 km/hr
C. 4.15 km/hr
D. 4.25 km/hr
Answer: Option B
Solution(By Examveda Team)
A's speed = 5 km/hr= $$\left( {5 \times \frac{5}{{18}}} \right)$$ m/sec
= $$\frac{25}{18}$$ m/sec
Time taken by A to cover 100 metres
= $$\left( {100 \times \frac{{18}}{{25}}} \right)$$
= 72 sec
Time taken by B to cover 92 metres
= (72 + 8) sec
= 80 sec
B's speed
$$\frac{92}{80}$$ m/sec
= $$\left( {\frac{{92}}{{80}} \times \frac{{18}}{5}} \right)$$ km/hr
= $$\frac{414}{100}$$ km/hr
= 4.14 km/hr
Related Questions on Races and Games
In a 100 m race, A can give B 10 m and C 28 m. In the same race B can give C:
A. 18 m
B. 20 m
C. 27 m
D. 9 m
A. 5.15 kmph
B. 4.14 kmph
C. 4.25 kmph
D. 4.4 kmph
A. 60 m
B. 40 m
C. 20 m
D. 10 m
In a 100 m race, A beats B by 10 m and C by 13 m. In a race of 180 m, B will beat C by:
A. 5.4 m
B. 4.5 m
C. 5 m
D. 6 m
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