A man can row against the current three fourth of a kilometer in 15 min and returns same distance in 10 min, then ratio of his speed to that of current?

Question

নিচের অপশন গুলা দেখুন

• 5:1
• 3:1
• 4:1
• 2:1

Answer 1

সঠিক উত্তর হচ্ছে: 5:1

ব্যাখ্যা:

Let the speed of the man in still water = p kmph

Speed of the current = s kmph

Now, according to the questions

(p + s) x 10 = (p - s) x 15

2p + 2s = 3p - 3s

=> p : s = 5 : 1

 

Hence, ratio of his speed to that of current = 5:1.