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Rehana leaves her home early in the morning so that she can reach her office on time. If she walks at the rate of 7 km/hr, then she reaches her office 8 minutes late. But, if she walks at a speed of 8 km/hr, then she reaches her office 4 minutes early. What is the distance in km between Rehana's house and her office?

Correct Answer: 11.2
মনে করি, বাসা থেকেoffice - এর দূরত্ব = x km 8 মিনিট দেরি আর 4 মিনিট আগেই পৌঁছে যাওয়া অর্থাৎ দুই গতিবেগে মোট অতিক্রান্ত সময় (8 + 4) মিনিট = 12 মিনিট = 1260 = 15 ঘন্টা। আমরা জানি, time = DistanceSpeed প্রশ্নানুযায়ী, x7 - x8 = 15⇒8x - 7x56 = 15⇒5x = 56⇒x = 565 = 11·2 অর্থাৎ দূরত্ব = 11.2 km

Rehana leaves her home early in the morning so that she can reach her office on time. If she walks at the rate of 7 km/hr then she reaches her office 8 minutes late. But, if she walks at a speed of 8 km/hr, then she reaches her 4 minutes early. What is the distance in km between Rehana's house and her office?

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