Question

in one hour, a car can cover 70 3/4 km. how much distance will it cover 2 2/5 hrs​

Answer 1

Answer:

Step-by-step explanation:

speed = distance/time

let speed = x

70 3/4 = 70.75

x = 70.75/1

therefore speed is 70.75 km/h

distance = speed * time

let distance = y

2 2/5 = 2.4

y = 70.75 * 2.4

y = 169.8

Answer 2

Answer:

The car covers 169.8km in $2\frac{2}{5}\:hrs$

Step-by-step explanation:

Given that,

A car can cover a distance of $70\frac{3}{4} \:km$ in 1 hour and we are required to find the distance it covers in a time of $2\frac{2}{5}\: hr$.

We shall write the given data in symbolic form as shown below-

$d_{1}=70\frac{3}{4} \:km=70.75km,t_{1}=1\:hour\\d_{2}=?,t_{2}=2\frac{2}{5} hr=2.4\:hours$

We know that,

Speed is the ratio of distance to the time hence we write it as

$v=\frac{d}{t}$ as the speed is constant,

we can write $\frac{d}{t} = > constant\\ = > \frac{d_{1}}{t_{1}}=\frac{d_{2}}{t_{2}}$

Substituting the known values in the above relation,we get

$\frac{70.75}{1} =\frac{d_{2}}{2.4} = > d_{2}=70.75\times2.4=169.8km$

Therefore,the car covers 169.8km in $2\frac{2}{5}\:hrs$

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