A car travels a distance x km on a straight road in 3 hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in km / h ) is

Question

A car travels a distance x km on a straight road in 3 hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in km / h ) is (A) (x/2) (B) (2 x/7) (C) (5 x/16) (D) (3 x/16)

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/2ebfb556c20be74c03e72ef5384b406e-.png" /> Vavg = (x + (x/4)/4) = (5x/16)

Q. A car travels a distance $x km$ on a straight road in $3$ hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in $km / h)$ is

$\frac{x}{2}$

$\frac{2 x}{7}$

$\frac{5 x}{16}$

$\frac{3 x}{16}$

$V_{a vg} = \frac{x + \frac{x}{4}}{4} = \frac{5 x}{16}$

Q. A car travels a distance xkm on a straight road in 3 hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in km/h) is

2x​

72x​

165x​

163x​