Let price of one pen = x Let price of one notebook = y Mohit bought 3 pens and 6 notebooks by paying an amount of ₹180. 3x + 6y = 180 3x = 180 – 6y x = (180 – 6y) ÷ 3 x = 60 – 2y --------- (i) Sudesh bought 5 pens and 2 notebooks by paying an amount of ₹116. 5x + 2y = 116 Putting the value of x from equation (i) 5(60 – 2y) + 2y = 116 300 – 10 y + 2y = 116 300 – 8y = 116 300 – 116 = 8y 184 = 8y y = 23 Mohit spend on buying notebooks = 6y = 6 x 23 = 138.
When travelling downstream, a boat takes 5.25 hours to travel 147 km. If the speed of the stream is (3/7)th of downstream speed of the boat, ...
A boat running downstream covers a distance of 36 km in 6 hrs and covering the same distance upstream in 9 hrs. What is the speed of a boat in still water?
A boat can cover ‘y’ km distance downstream in (t+2.5) hours. The same boat can cover ‘0.25y’ km distance upstream in ‘t’ hours. The time ta...
A boat, whose speed in still water is 25% more than the speed of the current, covers 315 km downstream in _____ hours. The speed of the boat in still w...
A boat goes 65 km in upstream in 5 hours and takes 4 hours to complete a distance of 20 km in downstream. Find the speed of boat in still water.
Ricky can go on a motor boat with a speed of 15 km/hour in still water to a certain upstream point and come back to the starting point in a river which ...
The speed of the stream is 15 km/h. Boat ‘A’ covers 140 km distance against the stream in 4 hours and boat ‘B’ covers 105 km distance against th...
Ratio of speed of boat in downstream and speed of stream is 9:5, if speed of current is 10 km/hr, then find distance travelled (in km) upstream in 6 hours.
The circumference of the two circles is 110 cm and 330 cm respectively. What is the difference between their radii?
Two boats X and Y start towards each other from two places, 76 km apart. Speed of the boat X and Y in still water are 8 km/hr and 11 km/hr respectively....
