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 ?
Solution
Correct Answer: Option B
Solution:
অনুবাদঃ ঘন্টায় 7 কিমি বেগে গেলে 8 মিনিট দেরী হয় । আর ঘন্টায় 8 কিমি বেগে 4 মিনিট আগে পৌছায় । আপনাকে দূরত্ব বের করতে হবে ।
Shortcut: দূরত্ব/১ম বেগ - Late = দূরত্ব/২য় বেগ + Early
=> D/7 - 8/60 = D/8 + 4/60 [মিনিটকে ঘন্টায় নিতে হবে ]
=> D = 11.2 km.
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