Question

a car moves with a speed of 50km/h for 20 minutes and then with the speed of 60km/h for next 15minutes .what is the total distance covered by car​

Answer 1

Answer:

Q10) A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60km/h for the next 15 minutes.

The total distance covered by the car is:

solution:

Speed (s1) = 40km/h

Time (t1) = 15 mins = (15/60) hr

Distance d1 = (s1 × t1) = 40 × (15/60) = 10 km

Speed (s2) = 60 km/h

Time (t2) = 15 min = (15/60) hour

Distance (d2) = (s2 × t2) = 60 × (15/60) = 15 km

Total distance (d) = (d1 + d2) = 10 km + 15 km = 25 km

Answer 2

CASE 1 :-

Speed of car = 50 km/hr

= 50× 1000/3600 m/s

= 13.8 m/s

Time taken = 20 minutes

= 20×60 seconds

= 1200 seconds

Distance travelled = speed × time

= 13.8 × 1200

= 16560 m

= 16.56 km

CASE 2 :-

Speed of car = 60 km/hr

= 60× 1000/3600 m/s

= 16.6 m/s

Time taken = 15 minutes

= 15×60 seconds

= 900 seconds

Distance travelled = Speed × time

= 16.6 × 900

= 14940 m

= 14.94 km

Therefore,

Total distance travelled = 16.56 + 14.94

= 31.5 km