A train can travel 50% faster than a car. Both start from point A at the same time and reach point B 75 kms away from A at the same time. On the way, however, the train lost about 12.5 minutes while stopping at the stations. The speed of the car is:
A. 100 kmph
B. 110 kmph
C. 120 kmph
D. 130 kmph
Answer: Option C
Solution(By Examveda Team)
$$\eqalign{ & {\text{Let}}\,{\text{speed}}\,{\text{of}}\,{\text{the}}\,{\text{car}}\,{\text{be}}\,x\,kmph \cr & {\text{Then,}}\,{\text{speed}}\,{\text{of}}\,{\text{the}}\,{\text{train}} \cr & = \frac{{150}}{{100}}x = {\frac{3}{2}x} \,kmph \cr & \therefore \frac{{75}}{x} - \frac{{75}}{{\left( {3/2} \right)x}} = \frac{{125}}{{10 \times 60}} \cr & \Rightarrow \frac{{75}}{x} - \frac{{50}}{x} = \frac{5}{{24}} \cr & \Rightarrow x = {\frac{{25 \times 24}}{5}} \cr & \Rightarrow x = 120\,kmph \cr} $$Join The Discussion
Comments ( 2 )
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
I didn't understand this guys
How came 150/100?