The speed of a boat is 10 km per hour (kph) and the speed of the currect is 5 kph. The boat traelled 5 hours in a favour of the current and then returned to the starting point. What was the time to return?

The speed of a boat is 10 km per hour (kph) and the speed of the currect is 5 kph. The boat traelled 5 hours in a favour of the current and then returned to the starting point. What was the time to return? Correct Answer 15 hours

স্রোতের অনূকূলে বেগ = নৌকা + স্রোতের বেগ = 10 + 5 = 15 কিমি 5 ঘন্টা অনূকূলে গেলে মোট দূরত্ব যায় = 5 × 15 = 75 কিমি; প্রতিকূলে 75 কিমি আসতে মানে যাত্রাস্থানে ফিরে আসতে সময় লাগে = 755 = 15 hours
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