## Speed, Time and Distance

#### Speed, Time and Distance

1. A bus covers a distance of 400 km with a speed of 20 km/h. What time is taken by the bus to cover this distance?
1. 25 h
2. 5 h
3. 21 h
4. 20 h

1. We know that, speed = Distance / Time

##### Correct Option: D

We know that, speed = Distance / Time
∴ Required Time = Distance / Speed = 400/20 = 20 h

1. The speed of a bus is 72 km/h. The distance Covered bye the bus in 5 s is
1. 50 m
2. 74.5 m
3. 100 m
4. 60 m

1. Given, speed of bus = 72 km/h = 72 x 5/18 = 20 m/s

##### Correct Option: C

Given, speed of bus = 72 km/h = 72 x 5/18 = 20 m/s
∴ Distance travelled in 5 s = 5 x 20 = 100 m

1. Ram and Shyam are moving in the directions opposite to each other. The Speeds of both persons are 10 km/h and 6 km/h, respectively. Find the speeds of Ram with respect of Shyam.
1. 6 km/h
2. 16 km/h
3. 4 km/h
4. 8 km/h

1. We know that for relative speed, the two speeds will be added, if the motions of the two objects are in opposite directions.

##### Correct Option: B

We know that for relative speed, the two speeds will be added, if the motions of the two objects are in opposite directions.
∴ Required speed = 10 + 6 = 16 km/h

1. Two cars are moving in the same direction with their respective speeds of 9 km/h and 5 km/h. Find the relative speed of 1st car with respect of 2nd.
1. 2 km/h
2. 4 km/h
3. 8 km/h
4. 6 km/h

1. We know that for relative speed, the subtraction of speeds takes place, if the motions of the two objects are in the same direction.

##### Correct Option: B

We know that for relative speed, the subtraction of speeds takes place, if the motions of the two objects are in the same direction.
∴ Required relative speed = 9 - 5 = 4 km/h

1. A man covered a distance of 12 km in 90 min by cycle. How much distance will he cover in 3 h, if he rides the cycle at a uniform speed?
1. 36 km
2. 24 km
3. 30 km
4. 27 km

1. Distance covered in 3 h = Speed x Time

##### Correct Option: B

We know that, speed = Distance / Time
Speed = 12/90 km/min

∴ Distance covered in 3 h = Speed x Time
= (12/90) x (3 x 60) = 24km