Question : The ratio between the speeds of two cars is 5 : 7. If the first car runs 200 km in 4 hours, then what is the speed of the second car?
Option 1: 65 kmph
Option 2: 60 kmph
Option 3: 50 kmph
Option 4: 70 kmph
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Correct Answer: 70 kmph
Solution :
Given,
Speed ratio of two cars = 5 : 7
Distance covered by the first car = 200 km
Time taken by the first car = 4 hours
⇒ The speed of the first car = $\frac{200}{4}$ kmph = 50 kmph
Since the ratio of speeds is 5 : 7,
the speed of the second car = $\frac{7}{5}$ × speed of the first car = $\frac{7}{5} × 50$ km/hr = 70 kmph
Hence, the correct answer is 70 kmph.
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