With an uniform speed, a car covers a distance in 8 hours. had the speed been increased by 4 km/hr, the same distance could have been covered in 7 hr and 30 min. What is the distance covered ?
A. 420 km
B. 480 km
C. 520 km
D. 640 km
Answer: Option B
Solution(By Examveda Team)
Let the speed of car be x km/hrDistance = Speed × Time
Distance = 8x km
According to the question,
$$\eqalign{ & \Rightarrow \left( {x + 4} \right) \times 7.5 = 8x \cr & \Rightarrow 7.5x + 30 = 8x \cr & \Rightarrow 8x - 7.5x = 30 \cr & \Rightarrow 0.5x = 30 \cr & \Rightarrow x = \frac{{30}}{{0.5}} = 60{\text{ km/hr}} \cr} $$
Required distance :
= 8 × 60
= 480 km
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
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