1.

The Speeds Of A And B Are In The Ratio 3: 4. A Takes 20 Minutes More Than B To Reach A Destination. In What Time Does A Reach The Destination?let The Time Taken By A Be X Hours?

Answer»

The time TAKEN by B =(X-20/60)hrs = (x-1/3)hrs 

Ratio of speeds = INVERSE ratio of time taken 

Therefore 3: 4 =(x-1/3) : x 

=>3x-1/3x=3/4 

=> 12X -4 =9x 

=> 3x =4 

=> X=4/3 hrs. 

X=1 1/3 hours. 

Required time = 1 1/3 hrs.

The time taken by B =(x-20/60)hrs = (x-1/3)hrs 

Ratio of speeds = Inverse ratio of time taken 

Therefore 3: 4 =(x-1/3) : x 

=>3x-1/3x=3/4 

=> 12x -4 =9x 

=> 3x =4 

=> X=4/3 hrs. 

X=1 1/3 hours. 

Required time = 1 1/3 hrs.



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