Question

. A bus travelling at a speed of 60 km/h
covers a distance in 4 hours. What time will
it take to cover this distance if the speed is
increased to 75 km/h.​

Answer 1

Given

✭ Speed of bus = 60 km/h

✭ Distance = 4 hours

To Find

◈ Time taken to cover the distance if the speed is 75 km/h

Solution

Concept

So here first we shall find the distance with the help of the formula to find speed, then substitute this again with the speed as 75 km/h to get the answer!!

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Speed is given by,

Speed = Distance/Time

• Speed = 60 km/h
• Time = 4 hours

Substituting the given values,

➝ Speed = D/T

➝ 60 = Distance/4

➝ 60×4 = Distance

➝ Distance = 240 km

Now in Case 2

• Speed = 75 km/h
• Distance = 240 km

So now the time will be,

➳ Speed = Distance/Time

➳ 75 = 240/Time

➳ Time = 240/75

➳ Time = 3.2 hours

☯ Know More

»» Acceleration is the rate of change of velocity

»» Acceleration = (v-u)/t

»» Acceleration is a vector quantity, that is it has both speed and magnitude

»» SI unit of acceleration is m/s²

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