## Speed, Time and Distance

#### Speed, Time and Distance

1. To cover a distance of 216 km in 3.2 hours, what should be the average speed of the car in metre/second?
1. 67.5 metre/second
2. 33.75 metre/second
3. 37.5 metre/second
4. 18.75 metre/second

1.  Required speed of car = Distance Time

 = 216 kmph. 3.2

 = 216 × 5 m./sec. 3.2 18

= 18.75 m./sec.

##### Correct Option: D

 Required speed of car = Distance Time

 = 216 kmph. 3.2

 = 216 × 5 m./sec. 3.2 18

= 18.75 m./sec.

1. At an average of 80 km/hr Shatabdi Express reaches Ranchi from Kolkata in 7 hrs. The
distance between Kolkata and Ranchi is
1. 560 km.
2. 506 km.
3. 560 m.
4. 650 m.

1. Distance = Speed × Time
= (80 × 7) km.
= 560 km.

##### Correct Option: A

Distance = Speed × Time
= (80 × 7) km.
= 560 km.

1. A man travels 50 km at speed 25 km/h and next 40 km at 20 km/h and there after travels 90 km at 15 km/h. His average speed is :
1. 18 kmph.
2. 25 kmph.
3. 20 kmph.
4. 15 kmph.

1. Total distance covered
= (50 + 40 + 90) km
= 180 km

 Time = Distance Speed

 ∴   Total time taken = 50 + 40 + 90 hours 25 20 15

= (2 + 2 + 6) hours
= 10 hours
 ∴  Average speed = Total distance Total time taken

 = 180 = 18 kmph 10

##### Correct Option: A

Total distance covered
= (50 + 40 + 90) km
= 180 km

 Time = Distance Speed

 ∴   Total time taken = 50 + 40 + 90 hours 25 20 15

= (2 + 2 + 6) hours
= 10 hours
 ∴  Average speed = Total distance Total time taken

 = 180 = 18 kmph 10

1. Gautam goes to office at a speed of 12 kmph and returns home at 10 kmph. His average speed is :
1. 11 kmph
2. 22 kmph
3. 10.9 kmph
4. 12.5 kmph

1. Here distances are same.

 ∴  Average speed = 2xy kmph x + y

 = 2 × 12 × 10 kmph 12 + 10

 = 240 kmph 22

= 10.9 kmph

##### Correct Option: C

Here distances are same.

 ∴  Average speed = 2xy kmph x + y

 = 2 × 12 × 10 kmph 12 + 10

 = 240 kmph 22

= 10.9 kmph

1. A bus travels 150 km in 3 hours and then travels next 2 hours at 60 km/hr. Then the average speed of the bus will be
1. 55 km/hr.
2. 54 km/hr.
3. 50 km/hr.
4. 60 km/hr.

1. Total distance covered by the bus = 150 km. + 2 × 60 km.
= (150 + 120) km.
= 270 km.

 ∴  Average speed = Total distance Time taken

 = 270 = 54 kmph. 5

##### Correct Option: B

Total distance covered by the bus = 150 km. + 2 × 60 km.
= (150 + 120) km.
= 270 km.

 ∴  Average speed = Total distance Time taken

 = 270 = 54 kmph. 5