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A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current. The speed of the current (in km/hour) is :

A4

B3

C2

D5

Answer:

A. 4

Read Explanation:

Solution:

Let the speed of the current be x kmph.

According to the question,

6km/hr=3(6x)6 km/hr=3(6-x)

66x=3\frac{6}{6-x}=3

183x=618-3x = 6

3x=1863x = 18-6

x=123=4kmphx=\frac{12}{3}=4 kmph

Speed of current = 4kmph.


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ഒരു ബോട്ട് Aയിൽ നിന്ന് Bയിലേക്കും തിരിച്ചും 4 മണിക്കൂർ കൊണ്ട് എത്തുന്നു. നിശ്ചലജലത്തിൽ ബോട്ടിന്റെ വേഗം 8 km/hr. ഒഴുക്കിന്റെ വേഗം 2 km/hr ആണെങ്കിൽ Aയിൽ നിന്ന് Bയിലേക്കുള്ള ദൂരം എത്ര?