# Quadratic Equations Case Study Based Questions 02 Term II

## Case Study Questions 02 The speed of a motor boat is 20 km/hr. For covering the distance of 15 km the boat took 1 hour more for upstream than downstream.

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

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