## Speed, Time and Distance

#### Speed, Time and Distance

1. If a person travel 39 km at a speed of 26 km/h, another 39 km at a speed of 39 km/h and 39 km again at a speed of 52 km/h . Then find the average speed of entire journey
1. 35 km/h
2. 35 km/h
3. 36 km/h
4. 40 km/h

1. Average speed of entire journey
= (39 + 39 + 39)/(39/26 + 39/39 +39/52)

##### Correct Option: C

Average speed of entire journey
= (39 + 39 + 39)/(39/26 + 39/39 +39/52)
= 3/(1/26 + 1/39 +1/52)
= 3/[(6 + 4 + 3)/156]
= 3 x 156/13 = 36 km/h

1. If speed of 31/3 m/s is converted to km/h, then it would be
1. 8 km/h
2. 9 km/h
3. 10 km/h
4. 12 km/h

1. ∵ 1 m/s = 18/5 km/h

##### Correct Option: D

∵ 1 m/s = 18/5 km/h
∴ 31/3 m/s = 10/3 m/s = (10/3) x (18/5) km/h
= 12 km/h

1. A car covers 300 km 15 h. Find the speed of the car ?
1. 20 km/h
2. 25 km/h
3. 15 km/h
4. 24 km/h

1. We know that, speed = Distance / Time

##### Correct Option: A

We know that, speed = Distance / Time
∴ Required speed = 300/15 =20 km/h

1. A car covers a distance of 690 km in 30 h. What is the average speed of the car?
1. 25 km/h
2. 23 km/h
3. 20 km/h
4. 18 km/h

1. Required speed = Distance / Time

##### Correct Option: B

Required speed = Distance/ Time
= 690/30
= 23 km/h

1. A bus is running with a uniform speed of 37 km/h. What distance will be covered by bus in 8 h?
1. 246 km
2. 289 km
3. 296 km
4. 276 km

1. We know that, Speed = Distance / Time

##### Correct Option: C

We know that, Speed = Distance / Time
∴ Required distance = Speed x Time
= 37 x 8 = 296 km