Answer :

Given.


Distance = 100km


If average speed been increased by 10 kilometres per hour, I could have reached here one hour earlier


Formula used.


Average speed =


Let the sum of time taken be x


Average speed =


New average speed = average speed + 10


+ 10





10x = (x–1)(10 + x)


10x = 10x + x2–10–x


x2–x–10 = 10x–10x = 0


x2–x–10 = 0


As comparing eq to ax2 + bx + c = 0


x =


x = = =


As √41 is greater than 1


time cannot get negative


Hence; time is hours


Average speed =


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Introduction to Linear Equations in Two VariablesIntroduction to Linear Equations in Two VariablesIntroduction to Linear Equations in Two Variables62 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

How many consecutKerala Board Mathematics Part-1

The perimeter of Kerala Board Mathematics Part-1

Can the sum of a Kerala Board Mathematics Part-1

Find two numbers Kerala Board Mathematics Part-1

A mathematiKerala Board Mathematics Part-1