Q. 104.2( 85 Votes )

# A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

i. 100 km ii. 25 km

iii. 15 km iv. 10 km

Answer :

Speed of the car in the first 15 minutes = 40 km/h

So, distance traveled in the first 15 minutes will be = speed x time

Distance = 40km/h x 15 minutes

Distance = (40 x 15/60) km = 10 km

Speed in next 15 minutes = 60 km/h

Distance traveled in next 15 min= speed in next 15 minutes × time

= 60 km/h x 15 min

= h

Distance in next 15 minutes = 15 km

The total distance covered by car = distance in first 15 min+ distance in next 15 min

Total distance = 10+15

= 25 km.

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Which of the following relations is correct?

i. Speed = Distance × Time

ii. Speed=

iii. Speed=

iv. Speed=

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