Question

A car covers a distance of $2km$ in $2.5$ minutes. If it covers half of the distance with speed $40km/hr$, the rest distance it shall cover with a speed of:

• A. $56km/hr$
• B. $60km/hr$
• C. $48km/hr$
• D. $50km/hr$

Answer 1

The correct option is B $60km/hr$

Given that,

Time $t=2.5min$

Distance $d=2km$

Now, firstly for half distance

$v=\frac{d}{t}$

$t=\frac{d}{v}$

$t=\frac{60\times 60}{40}$

$t=90s$

Now, total time is

$t=150-90$

$t=60s$

Now, the speed is

$v=\frac{d}{t}$

$v=\frac{1\times 60}{1}$

$v=60km/h$

Hence, the speed is $60km/h$