A man travelled a distance of 61 km in 9 hours. He travelled partly on foot at 4 km/hr and partly on bicycle at 9 km/hr. What is the distance (in km) travelled on foot?
Solution
Correct Answer: Option D
মনে করি,
হেঁটে যায় = x km
∴ সাইকেলে যায় = (61 - x) km
প্রশ্নমতে, x/4 + (61−x)/9 = 9
⇒ (9x + 244 - 4x)/36 = 9
⇒ 5x + 244 = 324
⇒ 5x = 80
⇒ x = 16 km
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