Question

a car moves with a speed of 50km/hr for 15 minutes and then with a speed of 70km/hr for the next 15 minutes .find the total distance covered by the car​

Answer 1

Answer:

A car moves with a speed of 50km/hr for 15 minutes and then with a speed of 70 km/hr for the next 15 minutes .find the total distance covered by the car​?

Answer: 30 km

Explanation:

We know that

speed = distance / time

distance = speed x time

therefore, distance covered by in first 15 minutes

                 = 50 x 15 / 60   (since 15 min = 15/60 hour )

                 = 75 / 6 km

and then distance covered by car in next 15 minutes

                = 70 x 15 / 60

                = 105 / 6 km

Hence, Total distance covered by the car = 75 / 6 + 105 / 6 = 180 / 6 = 30 km.

total distance covered by the car​ will be 30 km.

Answer 2

Given :

The initial speed of car = $S_1$ = 50 km/h

Initial time to cover distance = $T_1$ = 15 min = 0.25 hour

The final speed of car = $S_2$ = 70 km/h

final time to cover distance = $T_2$ = 15 min = 0.25 hour

To find :

Total distance cover by car

Solution

∵ Distance = Speed × Time

Let The initial distance = $D_1$  km

Let The final distance = $D_2$   km

Now,

For initial

 $D_1$  = $S_1$  ×  $T_1$

       = 50 km/h  ×  0.25 h

       = 12.5 km

For Final

 $D_2$  = $S_2$  ×  $T_2$

       = 70 km/h  ×  0.25 h

       = 17.5 km

So, Total distance cover by car = D = $D_1$  km + $D_2$   km

                                                           = 12.5  km  +  17.5  km

                                                           = 30 km

Hence, The Total distance cover by car with different speeds is 30 km . Answer