A motor car starts with a speed of 70 , km/hr | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) In the first $2 \, hours$,the distance covered is $70 	imes 2 = 140 \, km$.In the next $2 \, hours$,the speed increases to $80 \, km/hr$,so the d

Vedclass · Accepted Answer

$4\frac{1}{2} \, hours$

Vedclass · Answer

(C) In the first $2 \, hours$,the distance covered is $70 	imes 2 = 140 \, km$.In the next $2 \, hours$,the speed increases to $80 \, km/hr$,so the distance covered is $80 	imes 2 = 160 \, km$.Total distance covered in $4 \, hours = 140 + 160 = 300 \, km$.Remaining distance to be covered $= 345 - 300 = 45 \, km$.In the next interval,the speed increases to $90 \, km/hr$.Time taken to cover the remaining $45 \, km$ at $90 \, km/hr = \frac{45}{90} = 0.5 \, hours$.Total time taken $= 4 + 0.5 = 4.5 \, hours$ or $4\frac{1}{2} \, hours$.

$A$ motor car starts with a speed of $70 \, km/hr$ with its speed increasing every $2 \, hours$ by $10 \, km/hr$. In how many hours will it cover $345 \, km$?

Similar Questions

Two trains of equal length take $10 \, s$ and $15 \, s$ respectively to cross a telegraph post. If the length of each train is $120 \, m$,in what time (in $s$) will they cross each other while travelling in the same direction?

In a race of $1 \, km$,$A$ gives $B$ a start of $100 \, m$ and still wins by $20 \, s$. But if $A$ gives $B$ a start of $25 \, s$,$B$ wins by $50 \, m$. The time taken by $A$ to run $1 \, km$ is (in $s$):

How many $km/h$ does a man walk who passes through a street $600 \, m$ long in $5 \, minutes$?

The ratio between the speed of a bike and a train is $15:27$ respectively. Also,a bus covers a distance of $720 \, km$ in $9 \, hours$. The speed of the bike is three-fourths the speed of the bus. How much distance will the train cover in $7 \, hours$? (in $km$)

$A$ man travels first $50 \, km$ at $25 \, kmph$, next $40 \, km$ at $20 \, kmph$, and then $90 \, km$ at $15 \, kmph$. His average speed for the whole journey (in $kmph$) is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module