Question

Question:-
A car covers 120 km at a uniform speed of 60 km/h and the next 60
km at a uniform speed of 40 km/h. Find the total time taken.​​

Answer 1

➢ Answer

• Total time taken by the car to complete the journey = 3 hour 30 minutes.

➢ Given

• A car covers 120 km at a uniform speed of 60 km/h and the next 60 km at a uniform speed of 40 km/h.

➢ To Find

• Total time taken by the car to complete the journey.

➢ Step By Step Explanation

Given that ⤵

A car covers 120 km at a uniform speed of 60 km/h and the next 60 km at a uniform speed of 40 km/h.

We need to find the total time taken. by the car to complete the journey.

➠ Formula Used

$\dag\underline{\boxed{\tt{\color{navy}{Speed=\cfrac{Distance}{Time}}}}}$

➠ By substituting the values

• For 120 kilometers with the speed of 60 km/h.

$\longmapsto\tt60 = \cfrac{120}{Time} \\ \\ \longmapsto \tt60 \times Time = 120 \\ \\ \longmapsto\tt Time = \cancel\cfrac{120}{60} \\ \\ \longmapsto\tt{\pink{Time = 2 \: hours}}$

➠ Time = 2 hours.

• For 60 kilometers with the speed of 40 km/h.

$\longmapsto\tt40 = \cfrac{60}{Time} \\ \\ \longmapsto\tt40 \times Time = 60 \\ \\ \longmapsto\tt Time = \cancel\cfrac{60}{40} \\ \\\longmapsto {\tt \green{Time = \cfrac{3}{2}\: hours}}$

➠ Time = 3/2 hours or 1 hour 30 minutes.

Therefore, total time taken by the car to complete the journey = 2 + 1 hour 30 minutes = 3 hours 30 minutes.

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