A car travelling with $$\frac{5}{7}$$ of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
A. $$17\frac{6}{7}$$ km/hr
B. 25 km/hr
C. 30 km/hr
D. 35 km/hr
Answer: Option D
Solution(By Examveda Team)
Time taken :$$\eqalign{ & = 1\,{\text{hr}}\,40\,{\text{min}}\,48\,{\text{sec}} \cr & = 1\,{\text{hr}}\,40\frac{4}{5}{\text{min}} \cr & = 1\frac{{51}}{{75}}{\text{hrs}} \cr & = \frac{{126}}{{75}}{\text{hrs}} \cr} $$
Let the actual speed be x km/hr
Then,
$$\eqalign{ & \frac{5}{7}x \times \frac{{126}}{{75}} = 42 \cr & {\text{Or }}x = \left( {\frac{{42 \times 7 \times 75}}{{5 \times 126}}} \right) \cr & x = 35{\text{ km/hr}} \cr} $$
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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