CBSE Class 10 Answered
A train covers a distance of 90 km at a uniform speed. Had the speed been 15 km/hr more it would have taken 30 minutes less for the journey. Find the original speed of the train.
Asked by Topperlearning User | 12 Sep, 2017, 09:30: AM
Expert Answer
Let the original speed of train be 
km/h.
then increased speed 
km/hr
usual time 
hours
hours New time
hours
hoursAccording to the question
Rejecting the negative value, we have x = 45
Hence usual speed of train = 45 km/hr.
Answered by | 12 Sep, 2017, 11:30: AM
Application Videos
-
Nature of Roots
This video explains the concept of Discriminant and Nature of Roots. -
Determining roots and nature of roots using discriminan ...
This video explains a case study question on determining quadratic equat...
-
Quadratic Equation Equal Roots
The video explains an example based on the concept of equal roots of a q...
Concept Videos
-
Concept of discriminant to classify roots of quadratic ...
Understand the concept of discriminant to classify roots of quadratic equat... -
Nature of Roots
This video explains the concept of discriminant to classify roots of quadra... -
Nature of Roots
This video explains the concept of discriminant to classify roots of quadra... -
Quadratic Equations
Quadratic Equations, Nature of Roots -
D = 0
This video covers an application on nature of roots
CBSE 10 - Maths
Asked by dagardisha39 | 28 Apr, 2024, 12:58: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by rrajansinghakb199 | 08 Apr, 2024, 05:12: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by goyelgurav | 18 Dec, 2023, 11:23: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by mehraharshit.dk000 | 05 Oct, 2023, 08:05: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by atharvsharma971 | 06 Jun, 2022, 10:30: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by ankur.spsharma | 02 May, 2022, 11:54: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by iambkhatun343 | 14 Feb, 2022, 12:57: AM
ANSWERED BY EXPERT
