Question

A bus takes 18 minutes to cover a certain distance when travelling at a speed of
50 km/h. How much time will it take to cover the same distance when travelling
at a speed of 30 km/h?​

Answer 1

Answer:

It will take 30 minutes for bus to cover same distance with speed of 30km/h.

Explanation:

Given :

• Speed = 50km/hr = 50/60 km/min = 5/6 km/min(change is it min)
• Time taken by bus to cover distance = 18min

To Find :

• How much Time it will take to cover the same distance when travelling at a speed of 30 km/h?​

Solution :

As we know

$\boxed{\sf{Distance = Speed \times Time }}$

So,

$\dasharrow \sf{}18\times \dfrac{5}{6}$

$\dasharrow5\times3$

$\dasharrow\sf{} 15km$

$\boxed{\sf{Time =\dfrac{Distance}{Time}}}$

Therefore, time it'll take to cover 150km at 30km/h

$\dasharrow\sf{\dfrac{15}{30}hours}$

$\dasharrow \dfrac{1}{2}\sf{hours}$

Change it in minutes

$\dasharrow\dfrac{1}{2}\times 60\sf{min}$

$\dasharrow 30\sf{min}$

Answer 2

Answer:

Given, Speed =50 km/hr =50/60=5/6 km/min

Time taken by bus to cover distance =18 min

Distance=speed×time=18*5/6 =15 km

∴ Time it will take to cover 15 km at 30 km/h

= distance / speed =15/30 =1/2min

= 30 minutes.