Question

the distance between two places is 120 km .a car travelling at a certain speed can cover the distance in 2 hours 30 minutes by how many kilometre per hour should the speed of the car be increased for take it to 30 minutes less to cover the distance​

Answer 1

Answer:

12km/hr

Step-by-step explanation:

S=D/T

S=120/2.5

S=48Km/HR

2HRS30MIN-30MIN=2HR

S=D/T

S=120/2

S=60Km/HR

60-48=12Km/HR

Answer 2

Answer:

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Step-by-step explanation:

Distance = Rate x Time

From the question we know distance and time.

2:30 = 2.5 hours

D / T = R; therefore; 120 / 2.5 = original rate (speed) = OR

…30 minutes less than 2:30 = 2:00 hours = 2.0 hours

Also from the question we know distance and “new time”

Rate (speed) = Distance / Time

120 / 2.0 = new rate = NR

NR - OR = increase in speed required = your answer in kph