A boat sails m miles upstream at the rate of r miles per hour. If the rate of the stream is s miles per hour, how long will it take the boat to return to its starting point?

Created: 2 months ago | Updated: 3 weeks ago

m/(r+2s)

m/r+s

(m+r)/s

mr-s

None of these

Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

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এখানে,যেহেতু m কি.মি. পথ গিয়ে আবার ঐ পথেই ফিরে আসতে হবে তাই মোট পথ = m কি.মি.

r হচ্ছে প্রতিকূলের গতি এবং s হচ্ছে স্রোতের গতি তাই r এর সাথে s যোগ করলে স্থির গতি পাওয়া যাবে এবং দ্বিতীয় বার s যোগ করলে অনুকূল গতি পাওয়া যাবে ।

তাই অনুকূল গতি = r + s + s = r + 2s কি.মি.।

এখন মোট পথ m কে অনুকূল গতিবেগ r + 2s দিয়ে ভাগ করলেই কত সময় লেগেছে তা পেয়ে যাবো ।

সুতরাং m /(r+2s) (ans)

7 months ago

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ABC is a right angle of an isosceles triangle $∆ A B C . B D i s p e r p e n d i c u l a r t o A C . w h i c h o f t h e f o l l o w i n g, i f a n y, i s n o t a 45 ° a n g l e .$

Created: 2 months ago | Updated: 2 weeks ago

∠ B A D

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Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

302

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If a pipe fills a tank in h hours what part of the tank does it fill in 2 hours?

Created: 2 months ago | Updated: 2 weeks ago

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Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

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Created: 2 months ago | Updated: 2 weeks ago

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Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

545

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Created: 2 months ago | Updated: 2 weeks ago

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Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

636

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Created: 2 months ago | Updated: 2 weeks ago

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Job Solution Eastern Bank Ltd Eastern Bank Ltd - Officer - 2005 গণিত

294

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A boat sails m miles upstream at the rate of r miles per hour. If the rate of the stream is s miles per hour, how long will it take the boat to return to its starting point?

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