| The ratio between the speeds of two cars is 7: 8. If the 2nd car runs 200 km in 5 h, then find the speed of the 1st car. |
A) 25 km/h
B) 28 km/h
C) 40 km/h
D) 35 km/h
E) None of the above
Correct Answer: D
Solution :
| Let speed of 1st car be \[7x.\] |
| and speed of the 2nd car \[=8x\] |
| According to the question, |
| \[8x=\frac{200}{5}=40\] \[\left[ \text{using, speed=}\frac{\text{Distance}}{\text{Time}} \right]\] |
| \[\Rightarrow \]\[x=\frac{40}{8}=5\] |
| \[\therefore \]Speed of the 1st car \[=7x=7\times 5=35\,\,km/h\] |
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