Question

A car covers 60km with a uniform speed of 120kmph and the next 60km with a uniform speed of

80kmph. The total time taken by the car is​

Answer 1

Answer:

$\large\boxed{\sf{\dfrac{5}{4}\;hr.}}$

Explanation:

CASE I

Distance covered by car = 60 km

Speed of car = 120 km/h

To find the time,

We know that,

Time = distance/speed

=> t1 = 60/120

=> t1 = 1/2 h

CASE II

Distance covered by car = 60 km

Speed of car = 80 km/h

To find the time,

We know that,

Time = distance/speed

=> t2 = 60/80

=> t2 = 3/4 h

Let the total time taken in the journey = T

=> T = t1 + t2

=> T = 1/2 + 3/4

=> T = 2/4 + 3/4

=> T = (2+3)/4

=> T = 5/4 h

Hence, total time taken by car is 5/4 hours

Answer 2

Answer:

The total time taken by the car is 1 hour and 15 minutes.

Step-by-step explanation:

In the first case,

Given, Speed = 120 kmph

And, Distance = 60 km

Therefore, Time taken = Distance / Speed

= 60 / 120 = 1/2 hours.

Again,

In the second case,

Given, Speed = 80 kmph

And, Distance = 60 km

Therefore, Time taken = Distance / Speed

= 60 / 80 = 3/4 hours.

Total time taken = first time + second time

= 1/2 + 3/4 = 5/4 = 1.25 hours

= 1 hours 15 minutes.(answer).

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