Question

166. The speed of a car is 80 km/hr. After 2 hours
it covered one fourth of the total distance.
What is the total distance ?
(A) 640 km
(B) 120 km
(C) 80 km
(D) 100 km.​

Answer 1

640 km

Step-by-step explanation:

Speed =80 km/hr

Time=2 hours

Let the total distance be x

Now,

Distance=speed ×time

Distance=80×2=160 km

A.T.Q.

This distance=1/4 of total distance

160 = 1/4x

X=640 km

Totka distance=640 km

Answer 2

So, according to all the given condition

a car is travelling a speed of 80 kilometre per hour, and after two hour the distance it would cover will be one-fourth of the total distance of the journey of the car.

So, Let the total distance of journey be x

Speed of car = 80 kmh$^{-1}$

Time Taken to cover $\frac{1}{4} ^{th}$ of the total distance = 2 hours

so, this expression could be written as

$\frac{Distance Covered In 2 hours}{total Distance} = \frac{1}{4}$

Now, Distance = Speed $\times$ Time = 80 $\times$ 2 = 160 Km

Now Back to the equation

$\frac{160}{Total Distance} = \frac{1}{4}$

$640 km = total distance$

Hence, the total distance the car have to cover is

640 km