Question : A person goes from J to K at a speed of 55 km/hr. He comes back from K to J at a certain speed. If his average speed is $\frac{660}{17}$ km/hr, then what was his speed while moving from K towards J?
Option 1: 24 km/hr
Option 2: 38 km/hr
Option 3: 30 km/hr
Option 4: 42 km/hr

Question

Question : A person goes from J to K at a speed of 55 km/hr. He comes back from K to J at a certain speed. If his average speed is $\frac{660}{17}$ km/hr, then what was his speed while moving from K towards J?

Option 1: 24 km/hr

Option 2: 38 km/hr

Option 3: 30 km/hr

Option 4: 42 km/hr

Team Careers360 · Accepted Answer

Correct Answer: 30 km/hr

Solution : Speed, $S_1$ = 55 km/hr
Average speed = $\frac{660}{17}$ km/hr
Let $S_2$ be the required speed.
Average speed = $\frac{2S_1S_2}{S_1+S_2}$
$⇒\frac{660}{17}=\frac{2×55×S_2}{55+S_2}$
$⇒\frac{660}{17}=\frac{110×S_2}{55+S_2}$
$⇒\frac{6}{17}=\frac{S_2}{55+S_2}$
$⇒330 + 6S_2 = 17S_2$
$⇒330 = 11S_2$
$ herefore S_2 = 30$ km/hr
Hence, the correct answer is 30 km/hr.

Exams

Colleges

Predictors

Resources

Quick links

Exams

Colleges & Courses

Predictors

Resources

Exams

Colleges

Predictors & E-Books

Resources

Engineering Preparation

Medical Preparation

Online Courses

Products

Exams

Colleges

Resources

Exams

Colleges

Predictors & Articles

Resources

Exams

Colleges

Predictors

Resources

Exams

Colleges

Upcoming Events

Resources

Exams

Colleges

Resources

Quick Links

Top Streams

Specializations

Resources

Top Providers

Exams

Colleges

Resources

Diploma Colleges

Exams

Colleges

Resources

Exams

Resources

Top Courses & Careers

Colleges

Exams

Upcoming Events

Resources

Other Exams

Exams

Colleges

Top Countries

Student Visas

Exams

Top Schools

Products & Resources

NCERT Study Material

Question : A person goes from J to K at a speed of 55 km/hr. He comes back from K to J at a certain speed. If his average speed is 66017 km/hr, then what was his speed while moving from K towards J?Option 1: 24 km/hrOption 2: 38 km/hrOption 3: 30 km/hrOption 4: 42 km/hr

Related Questions

Know More about

Upcoming Exams

Trending Articles around SSC MTS

Download the Careers360 App on your Android phone

Sign In/Sign Up

Question : A person goes from J to K at a speed of 55 km/hr. He comes back from K to J at a certain speed. If his average speed is $\frac{660}{17}$ km/hr, then what was his speed while moving from K towards J?
Option 1: 24 km/hr
Option 2: 38 km/hr
Option 3: 30 km/hr
Option 4: 42 km/hr