Question

a train covers a distance in 4 and a half hour at a speed of 72km/hr. How much time will the train take to cover the same distance at a speed of 81km/hr?
plz, answer this question with explanation.
I will mark them as brainliest.

Answer 1

Given

Time =
$4 \frac{1}{2} \: hr$

Convert the mixed fraction to improper fraction
$4 \frac{1}{2} = \frac{9}{2} \: hr$

Speed = 72 km/hr


Since time and speed is known, we can calculate the distance travelled.

Distance travelled = speed × time

=> 9/2 × 72

= 9 × 36

= 324 km


Now we have distance = 324 km

We have to find the time if the speed is 81 km/hr.


Distance = Speed × Time

=> Time = Distance/Speed

=> Time = 324/81

=> Time = 4 hr.

Answer :- 4 hrs

Answer 2

$\bf\huge\boxed{\boxed{\boxed{\:Content\:Quality}}}$

Time = $\bf\huge\frac{9}{2}$

Speed = 72 km/hr

Find the distance travelled :-

Distance travelled :-

= Speed × time

= $\bf\huge\frac{9}{2}$ × 72

= 9 × 36

= 324 km

$\bf\huge\boxed{\boxed{\:Hence}}}$

Distance = 324 km

Calculate the time when the speed is 81 km/hr.

Distance = Speed × Time

=> Time = $\bf\huge\frac{Distance}{Speed}$

=> Time = $\bf\huge\frac{384}{81}$

=> Time = 4 hr.

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$\bf\huge\boxed{\boxed{\boxed{\:Be\:Brainly}}}$