MEDIUM
10th CBSE
IMPORTANT
Earn 100

The product of Reena's age (in years) 5 years ago and her age 8 years later is 30. Find her present age.

Important Questions on Quadratic Equations

MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 1

The speed of a boat in still water is 8 km/h. It can go 15 km upstream and 22 km downstream in 5 hours. If the speed of the stream is k km/h, then find the value of k.

MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 2
A passenger train takes 2 hours less for a journey of 300 km, if its speed is increased by 5 km/h from its usual speed. If its usual speed is k km/h, then find the value of k.
MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 3
A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. If the original speed of the train is k km/hr, then find the value of k.
MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 4
A train covers a distance of 90 km at a uniform speed. Had the speed been 15 km/hour more, it would have taken 30 minutes less for the journey. If the original speed of the train is k km/hr, then find the value of k.
MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 5
A motorboat whose speed is 9 km/h in still water, goes 15 km downstream and comes back in a total time of 3 hours 45 minutes. If the speed of the stream is k km/hr, then find the value of k.
MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 6
A motorboat whose speed is 18 km/h in still water, takes 1 hour more to go 24 km upstream than to return to the same point. If the speed of the stream is k km/hr, then find the value of k.
MEDIUM
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 7
The distance between Mumbai and Pune is 192 km. Travelling by Deccan Queen, it takes 48 minutes less than another train.If the speeds of the two trains differ by 20 km/hr. And if the speed of the Deccan Queen is k km/h, then find the value of k.
HARD
10th CBSE
IMPORTANT
Modern's abc+ of Mathematics for Class 10>Chapter 4 - Quadratic Equations>EXERCISE>Q 8
An aeroplane left 50 minutes later than its scheduled time, and in order to reach the destination, 1250 km away in time, it had to increase its speed by 250 km/h from its usual speed. If the original speed of aeroplane is k km/hr, then find the value of k.