## Mathematics TERM II

## Quadratic Equations

## Class 10 Session 2021-2022

## Case Study Questions 02

1. Let speed of the stream be `x` km/hr, then speed of the motorboat in upstream will be

(a) 20 km/hr

(b) `(20 + x)` km/hr

(c) `(20 – x)` km/hr

(d) 2 km/hr

(c) `(20 – x)` km/hr

2. What is the relation between speed, distance and time?

(a) speed = `\frac{distance}{time}`

(b) distance = `\frac{speed}{time}`

(c) time = speed `\times` distance

(d) speed = distance `\times` time

(a) speed = `\frac{distance}{time}`

3. Which is the correct quadratic equation for the speed of the stream?

(a) `x^{2}+30x-200=0`

(b) `x^{2}+20x-400=0`

(c) `x^{2}+30x-400=0`

(d) `x^{2}-20x-400=0`

(c) `x^{2}+30x-400=0`

4. What is the speed of stream?

(a) 20 km/hour

(b) 10 km/hour

(c) 15 km/hour

(d) 25 km/hour

(b) 10 km/hour

5. How much time boat took in downstream?

(a) 90 minutes

(b) 15 minutes

(c) 30 minutes

(d) 45 minutes

(c) 30 minutes