Question : A man travelled a distance of 99 km in 9 hours. He travelled partly on foot at the rate of 9 km/hr and partly on bicycle at the rate of 18 km/hr. What is the distance (in km) travelled on foot?
Option 1: 36
Option 2: 54
Option 3: 63
Option 4: 45
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Correct Answer: 63
Solution :
Let the time travelled on foot be $x$ hours, and the time travelled on bicycle is = $(9-x)$ hours
So, the distances travelled on foot and bicycle are 9x km and 18(9 – x) km, respectively.
Here, $9x + 18(9-x) = 99$
⇒ $9x = 162-99$
⇒ $x=\frac{63}{9}= 7$ hours
Therefore, the distance travelled on foot is = (9 × 7) km = 63 km
Hence, the correct answer is 63.
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