0

Guest

Courses New

A truck travels some distance with the constant speed of 30kmh -1 and return back with the constant speed of 40kmh-1. Calculate the average speed of truck.

A truck travels some distance with the constant speed of 30kmh -1 and return back with the constant speed of 40kmh-1. Calculate the average speed of truck.

Grade:9

2 Answers

Arun
25750 Points
5 years ago
Dear Ashish
 
Avg speed = distance /time
 
 = x + x / (x/30 + x/40) = 2x /70x/1200
 
 = 2400x /70 x = 34.2855 km/hour
Kushal Chaudhari
102 Points
5 years ago
The average speed is =total distance /total time 
Distance from starting to end =x 
Then total distance =2x
Since Speed=distance / time 
Therefore Time =distance /speed
Time from start to end point = x/30
Time from end to start point =x40
Total time taken =(x/30)+(x/40)
Average speed = total distance /total time
=2x/(x/30)+(x/40)
=2x/7x/120
=2x *120/7x
=240x/7x
=34.2857143 km /hour
 
 

Think You Can Provide A Better Answer ?

Other Related Questions on 9 grade science

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More