A boat goes 13km upstream in 39 minutes. The speed of stream is 3km/hr. The speed of boat in still water is-

Created: 4 months ago | Updated: 2 months ago
Job Solution Combined Bank (সমন্বিত ব্যাংক) সমন্বিত ১০ ব্যাংক ও আর্থিক প্রতিষ্ঠান || অফিসার (জেনারেল) (08-03-2024) গণিত
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Let speed of the boat is u kmph

Speed of the stream is v = 3 kmph

Time taken t = 39 min = 39/60 hour

Distance s = 13 km

We have

u - v = s/t

u - v = 13/(39/60) = (13×60)/39 = 20

= > u - 3 = 20

= > u = 20 + 3 = 23

Ans 23 kmph

4 months ago
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