Question

A car moves with a speed of 40 km / h for 15 minutes an-d then with a speed of 60km / h for the next 15 minutes . The total distance Covered by the car is
1) 100km
2) 25kM
3) 15km
4) 10km

Answer 1

2)25 km

In first case,

Speed =40kmph

Time taken =15min.=1/4 hr

Dis. =s/t=40/4=10km

In second case,

Speed =60kmph

Time taken =15min=1/4hr

Dis.=s/t=60/4=15km

Total distance =10+15=25km

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Answer 2

Answer:

[2]

The body moved with a speed of 1 km/ min for again, 15 minutes. so we have

• Speed = 1 km/min Time = 15 minutes

Similarly, the distance travelled in this journey can be calculated as

Distance = Speed Time

d, = 1x 15

d2 = 15 km

Now, The total distance travelled by the car is the sum of Distances covered in both the situations, which is

- Total distance travelled = d; + d2

Total distance travelled = 10 + 15

Total distance travelled = 25 km

:. Option (1) is correct.We know, 1 hour = 60 minutes, so

- 40 km/hr

- 40/60 x km/min

4/6 km/min

- 2/3 km/min

Also,

- 60 km/hr

- 60/60 km/min

- 1 km/min

Now, There are two situations,

[1]

The car moved with a speed of 2/3

min for 15 minutes, so we have

Speed = 2/3 km/min Time = 15 minutesA car move with a speed of 40 km/h for 15 minutes and then with a speed of a 60km /h

the next 15 minutes. The total distance covered by the car is:

1) 25km

100 km

i) 15km

Those who will answer I will him or her a brainalistGiven :

· A car moved with a speed of 40 km/hr 60 km/hr for the next 15 minutes.

for 15 minutes and then with a speed of

To Find :

· Total distance travelled by the body.

Solution :

We are given speed and time in different units, so first, we have to make them of same units like if the time is given in minutes then the speed should in distance travelled per minute.