## Speed, Time and Distance

#### Speed, Time and Distance

1. An athlete runs 200 metres race in 24 seconds. His speed (in km/hr) is :
1. 20
2. 24
3. 28.5
4. 30

1.  Speed = Distance Time

 = 200 m/s 24

 200 m/s = 10 × 18 = 30 km/hr. 24 24 5

 ∵   x m/s = 18 x km/hr 5

##### Correct Option: D

 Speed = Distance Time

 = 200 m/s 24

 200 m/s = 10 × 18 = 30 km/hr. 24 24 5

 ∵   x m/s = 18 x km/hr 5

1. A man crosses a road 250 metres wide in 75 seconds. His speed in km/hr is :
1. 10
2. 12
3. 12.5
4. 15

1.  Speed = Distance = 250 75 3

 = 10 m/sec = 10 × 18 km/hr. 3 3 5

 ∵   1 m/s = 18 km/hr 5

= 2 × 6 km/hr. = 12 km/hr.

##### Correct Option: B

 Speed = Distance = 250 75 3

 = 10 m/sec = 10 × 18 km/hr. 3 3 5

 ∵   1 m/s = 18 km/hr 5

= 2 × 6 km/hr. = 12 km/hr.

1. A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in metres) is :
1. 600
2. 750
3. 1000
4. 1250

1. Speed of the man = 5km/hr

 = 5 × 1000 m / min = 250 m / min 60 3

Time taken to cross the bridge
= 15 minutes
Length of the bridge
= speed × time
 = 250 × 15m = 1250m 3

##### Correct Option: D

Speed of the man = 5km/hr

 = 5 × 1000 m / min = 250 m / min 60 3

Time taken to cross the bridge
= 15 minutes
Length of the bridge
= speed × time
 = 250 × 15m = 1250m 3

1. An aeroplane covers a certain distance at a speed of 240 km hour in 5 hours. To cover the
 same distance in 1 2 hours, it must 3
travel at a speed of :
1. 300 km./hr.
2. 360 km./hr.
3. 600 km./hr.
4. 720 km./hr.

1. Let the required speed is x km/hr

 Then, 240 × 5 = 5 × x 3

∴  x = 720 km/hr.

##### Correct Option: D

Let the required speed is x km/hr

 Then, 240 × 5 = 5 × x 3

∴  x = 720 km/hr.

1. A train is travelling at the rate of 45km/hr. How many seconds it
 will take to cover a distance of 4 km ? 5
1. 36 sec.
2. 64 sec.
3. 90 sec.
4. 120 sec.

1.  Time taken = Distance time

 = (4/5) hour 45

 = 4 × 60 × 60 sec. 5 × 45

= 64 seconds

##### Correct Option: B

 Time taken = Distance time

 = (4/5) hour 45

 = 4 × 60 × 60 sec. 5 × 45

= 64 seconds