[4 \dfrac{2}{3} km/hr] A girl can row 4 \dfrac{2}{3} km/hr in still water and she finds that it takes her thrice as much

For Competitive Exams

A girl can row 4 $\dfrac{2}{3} $ km/hr in still water and she finds that it takes her thrice as much time to row up than as to row down the same distance in river. The speed of the current is :

3 $\dfrac{1}{3} $ km/hr

3 $\dfrac{1}{9} $ km/hr

1 $\dfrac{1}{4} $ km/hr

4 $\dfrac{2}{3} $ km/hr

Explanation:
Let speed upstream be x kmph Then speed downstream = 3x kmph
Speed in still water = 1/2(3x+x)kmph=2xkmph
∴2x= 28/3
⇒x=14/3
So Speed upstream =14/3 km/hr
Speed downstream = 14 km/hr
Hence speed of the current = 1/2 (14−14/3)km/hr
= 14/3 km/h
=4 $\dfrac{2}{3} $ km/hr

Additional Questions

A person can swim in water at 4 km/h. If the speed of water 2km/h, how many hours will the man take to swim back against the current for 6km?	Answer
A man can row his boat with the stream at 6km/h and against the stream in 4 km/h. The man’s rate is?	Answer
A person can row at 9kmph and still water. He takes 4 ½ hours to row from A to B and back . what is the distance between A and B if the speed of the stream is 1 kmph?	Answer
A person can row 750 metres against the stream in 11 ¼ minutes and returns in 7 ½ minutes. The speed of the person in in still water is :	Answer
If a man rows at the rate of 6 kmph in still water and his rate aginst the current is 4.5 kmph, then the mans rate along the current is	Answer
A boat moves upstream at the rate of 1 km in 20 minutes and down stream 1 km in 12 minutes. The speed of the current is :	Answer
A man can row a boat at 10 kmph in still water and the speed of the stream is 8 kmph. What is the time taken to row a distance of 90 km down the stream ?	Answer
If athul rows 16 km upstream and 24 km down steam taking 4 hours each, then the speed of the stream	Answer
A man rows to a place 48km distant and back in 14 hours. He finds that he can row 4km with the stream in the same time as 3km against the stream. The rate of the stream is	Answer
The current of stream runs at 1kmph. A motor baot goes 35km upstream and back again to the starting point in 12hours. The speed of the motor boat in still water is	Answer

Share with Friends