Question

9. Saira drives her car with a uniform speed of 45 km h-1. Find :
(a) the distance covered by her in 2 hour 20 minutes
(b) time taken by her to cover 285 km
(c) her speed in m min-1​

Answer 1

Answer:

a)  105 km

b) 6 hour 20 min

c)  750 meters per minute

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Answer 2

Given:

• Saira drives her car with a uniform speed of 45 km/h

To Find:

• The distance covered(D) by her in 2 hour 20 minutes.
• Time taken(T) by her to cover 285 km.
• Her speed(S) in m/s

Solution:

(a) We have,

• S = 45km/h
• T = 2h 20min = 7/4h
• D = ?

D = S × T

D = 45 × 7/4

D = 315/4

D = 78.75km

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(b) We have,

• S = 45km/h
• D = 285km
• T = ?

T = D/S

T = 285/45

T = 19/3h

$\sf{T = 6 \frac{1}{3}h}$

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(c) To convert speed km/h into m/s, we have to multiply the given speed by 5/18.

45 × 5/18

= 225/18

= 12.5m/s