Chapter 4 Class 10 Quadratic Equations
Serial order wise

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.

The speed of a motor boat - Teachoo.jpg

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Question 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

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Question 2

What is the relation between speed ,distance and time?
(a) speed = (distance )/time
(b) distance = (speed )/time
(c) time = speed x distance
(d) speed = distance x time

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Question 3

Which is the correct quadratic equation for the speed of the current ?
(a) x 2 +30x-200=0
(b) x 2 +20x-400=0
(c) x 2 +30x-400=0
(d) x 2 -20x-400=0

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Question 4

What is the speed of current ?
(a) 20 km/hour
(b) 10 km/hour
(c) 15 km/hour
(d) 25 km/hour

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Question 5

How much time boat took in downstream?
(a) 90 minute
(b) 15 minute
(c) 30 minute
(d) 45 minute

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Transcript

Question 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.Question 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 Question 2 What is the relation between speed ,distance and time? (a) speed = (distance )/time (b) distance = (speed )/time (c) time = speed x distance (d) speed = distance x time (b) distance = (speed )/time Question 3 Which is the correct quadratic equation for the speed of the current ? (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 Question 4 What is the speed of current ? (a) 20 km/hour (b) 10 km/hour (c) 15 km/hour (d) 25 km/hour(b) 10 km/hour Question 5 How much time boat took in downstream? (a) 90 minute (b) 15 minute (c) 30 minute (d) 45 minute(d) 45 minute

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.