Question

Question 35

An auto rickshaw takes 3 hours to cover a distance of 36 km. If its speed is increased by 4 km/h, the time taken by it to cover the same distance is___.

Answer 1

An auto rickshaw takes 3 h to cover a distance of 36 km.
Then, its speed =$\frac{36}{3}=12km/h$ $[\because speed=\frac{distance}{time}]$
It its speed increases 4 km/h, then
New speed =12+4 =16 km/h
Now, time taken by auto rickshaw to cover 36 km in $\frac{36}{16}h=\frac{36\times 60}{16}=135min$
$[\because$ 1h=60 min]
$=2\times 60$ +15=2 h 15 min