Speed, Time and Distance
 To cover a distance of 216 km in 3.2 hours, what should be the average speed of the car in metre/second?

 67.5 metre/second
 33.75 metre/second
 37.5 metre/second
 18.75 metre/second

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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.
 At an average of 80 km/hr Shatabdi Express reaches Ranchi from Kolkata in 7 hrs. The
distance between Kolkata and Ranchi is

 560 km.
 506 km.
 560 m.
 650 m.

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Distance = Speed × Time
= (80 × 7) km.
= 560 km.Correct Option: A
Distance = Speed × Time
= (80 × 7) km.
= 560 km.
 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 :

 18 kmph.
 25 kmph.
 20 kmph.
 15 kmph.

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Total distance covered
= (50 + 40 + 90) km
= 180 kmTime = 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 kmTime = 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
 Gautam goes to office at a speed of 12 kmph and returns home at 10 kmph. His average speed is :

 11 kmph
 22 kmph
 10.9 kmph
 12.5 kmph

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Here distances are same.
∴ Average speed = 2xy kmph x + y = 2 × 12 × 10 kmph 12 + 10 = 240 kmph 22
= 10.9 kmphCorrect Option: C
Here distances are same.
∴ Average speed = 2xy kmph x + y = 2 × 12 × 10 kmph 12 + 10 = 240 kmph 22
= 10.9 kmph
 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

 55 km/hr.
 54 km/hr.
 50 km/hr.
 60 km/hr.

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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