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Let the speed of the stream be ‘x’ km/hr Therefore, speed of the boat in still water = 7.5x km/hr Upstream speed of the boat = 7.5x – x = 6.5x km/hr Downstream speed of the boat = x + 7.5x = 8.5x km/hr According to the question, 8.5x – 6.5x = 40 => 2x = 40 => x = 20 Therefore, upstream speed of the boat = 6.5x = 130 km/hr Required time taken = 260/130 = 2 hours
The ratio of age of A and his son is 9:2. If the difference of their ages 7 year ago is 21, then find the sum of ages of A and his son 13 year hence?
My sister is 5 years elder to me. My father was 30 years of age when my brother was born while my mother was 28 years of age when I was born. If my bro...
A is five times as old as B. C was twice-as old as A six years ago. In six years' time, A will be 31. Find the sum of the present ages of B and C.
Present ages of P and Q are in the ratio 7:8 respectively. If Q’s age, 8 years hence from now will be 2 times of P’s age, 5 years ago from now, then...
7 years ago, the ratio of the ages of A and B was 1:2 and after 7 years it will become 3:5. Find their present ages.
The average ages of A, B and C is 20% more than the average ages of A and B. 10years hence from now, the ratio of the ages of A and C will be 3:5, respe...
Three years ago, the ages of Arnav and Bheema were in the ratio 3:4. Chinky’s current age is 33.33% greater than Arnav’s curr...
Two years ago, the combined ages of Armaan and Bikash equaled Chetna's age at that time. Ten years ago, Armaan was twice as old as Bikash. If, in five y...
5 years ago, the average age of a family of five persons was 30 years. In between these 5 years the family adopted a girl. Now at present the average ag...
