1. Udit can complete his work in 10 days. What amount of work will be completed in 8 days?
2. A train 150m long is running at a speed of 72 km/hr. It crosses a bridge in 13 seconds. Find the length of the bridge
3. If x and y vary inversely and x = 25, when y = 3. Find y, when x =15 (explain with the whole process)
1>Udit takes 10 days to complete a work.
So applying the Unitary method in order to get the solution.
2>Let the length of the bridge be x.
So the speed of the train in m/s is 20 m/s.
Therefore a total of x+150 m is travelled by train in 13 sec.
3>Since x and y vary inversly. So,
So find the value of k we have when x=25, y=3
Therefore the equation is
So , for x =15,