Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 10 Answered

A car made a run of 390km in x hours. If the speed had been 4 km/hour more it would have taken 2 hours less for the journey . Find x    
Asked by appujinju4 | 13 Jan, 2019, 04:10: PM
answered-by-expert Expert Answer

Let speed of car be y

Therefore 390/x=y

and

390/x-2=y+4

subtract both equations to get

390 over straight x minus fraction numerator 390 over denominator straight x minus 2 end fraction equals negative 4 390 open parentheses fraction numerator negative 2 over denominator straight x squared minus 2 straight x end fraction close parentheses equals negative 4 straight x squared minus 2 straight x minus 195 equals 0

(x-15)(x+13)=0

Therefore x is 15 hours as x cannot be negative as it is time.

Answered by Arun | 13 Jan, 2019, 06:44: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
ICSE 10 - Maths
3√2x×x-5x-√2
question image
Asked by ashwanikaler9 | 11 Apr, 2024, 01:50: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
(x+1)(2x+8)=(x-7)(x+3)
Asked by ajaykumarnaryal75 | 28 May, 2023, 01:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
(a+b)²x²-(a+b)x-6=0;(a+b)≠0 Take: (a+b)x=y  
Asked by adityasambangi08 | 19 May, 2023, 05:04: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
8/x+3-3/2-x=2
Asked by mohitmore008 | 31 Jul, 2022, 11:42: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
9/2x=5+x square
Asked by sefalikumari.yadav | 22 Jun, 2022, 05:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
2x4 - 5x2+3=0
Asked by sushenmahato74 | 20 Jun, 2022, 07:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
3x (2x-5) +6=2x(3x+5) -6
Asked by akshathasapphireservices | 10 Jul, 2021, 05:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
x+1/x-1=3x-7/2x-5
Asked by pruthaveshmenesj01052 | 06 Jun, 2021, 09:42: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
3x^2 - 2√6x+2=0
Asked by mohantyhoney9 | 26 May, 2021, 10:43: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
4a
question image
Asked by rdk_kulkarni | 07 Sep, 2020, 05:11: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×