h for the whole journey?...

Questions

skirfan92004 @skirfan92004

August 2021 2 28 Report

On a 200 km track, a train travels the first 50 km at a uniform speed of 40 km/h. How fast train must travel the next 150km so as to maintain the average speed of 60 km/h for the whole journey?

Muskan1101 Let the total time taken be x.
$average \: speed = \frac{total \: distance}{total \: time \: taken}$
$60 = \frac{200}{x}$
$x = \frac{200}{60} = \frac{10}{3}$
D1=50m
S1 =40 km/h
T1 =?

D2=150km
S2 =?
T2=?

Since we know that,
$speed = \frac{distance}{time}$
so,
$time = \frac{distance}{speed}$
$t 1 = \frac{d1}{s1} = \frac{50}{40} = \frac{5}{4}$
And,
Similarly..
$t2 = \frac{d2}{s2} = \frac{150}{s2}$
Now,
A/q
$\frac{5}{4} + \frac{150}{s2} = \frac{10}{3}$
$\frac{150}{s2} = \frac{10}{3} - \frac{5}{4} \\ \frac{150}{s2} = \frac{40 - 15}{12} = \frac{25}{12}$
$s2 = \frac{12 \times 150}{25}$
s2=72km/h

Muskan1101 thanks for brainliest :)

Add an Answer

Helpful Links

About Us

Terms and Conditions

Questions

Answers & Comments

Add an Answer

Find the missing number...

Please Answer and get brainliest...

Please answer right and get brainliest...

Please give right answer and get brainliest...

Please answer right and get brainliest...

what was the reaction of the Robespierre's government to improve lives of women?...

hr on a straight road stops on applying brakes after covering a distance of 20 m...

h in 30m just after the start. Calculate the acceleration of the car...

who had given in Sliverzone Science Olympaid in class 9 2019 only and plzz.don't...

Who had given in Sliverzone Science Olymapaid in class 9 2019 and plzzz.Don't wr...

Recommend Questions

Helpful Links

Helpful Social