Question

Ganesh travelled a distance of 108 km
by a car in 2 hours. His speed in metres
per second is
( )
A) 15
B) 54
C) 27 D) 30​

Answer 1

Answer:

• His speed in metres per second is 15 m/sec.

Step-by-step explanation:

Given that:

• Ganesh travelled a distance of 108 km.
• Time taken to cover the distance = 2 hours

Converting the distance in m:

• 1 km = 1000 m
• 108 km = (108 × 1000) m = 108000 m

Converting time in second:

• 1 hour = 3600 seconds
• 2 hours = (2 × 3600) seconds = 7200 seconds

Finding the speed:

• Speed = Distance/Time
• Speed = 108000/7200 m/sec
• Speed = 15 m/sec

Answer 2

Answer:

Given :-

• Ganesh travelled a distance of 108 km by a car in 2 hours.

To Find :-

• What is the speed of a car in m/sec.

Formula Used :-

➦ To find speed we know that,

${\red{\boxed{\large{\bold{Speed =\: \dfrac{Distance}{Time}}}}}}$

Solution :-

➲ First, we have to convert km to m.

As we know that,

★ 1 kilometres = 1000 metres ★

Given :

• Distance = 108 km

Then,

⇒ $\sf Distance =\: 108 \times 1000$

➤ $\sf\bold{\green{Distance =\: 108000\: m}}$

Hence, the distance in metre is 108000 m

➲ Again, we have to convert hours to seconds,

As we know that,

✪ 1 hours = 3600 seconds ✪

Given :

• Time = 2 hours

Then,

⇒ $\sf Time =\: 2 \times 3600$

➤ $\sf\bold{\green{Time =\: 7200\: seconds}}$

Hence, the time in seconds is 7200 seconds.

➦ Now, we have to find the speed in m/sec,

Given :

• Distance = 108000 m
• Time = 7200 sec

According to the question by using the formula we get,

↦ $\sf Speed =\: \dfrac{1080\cancel{00}}{72\cancel{00}}$

↦ $\sf Speed =\: \dfrac{\cancel{1080}}{\cancel{72}}$

➠ $\sf\bold{\purple{Speed =\: 15\: m/sec}}$

${\underline{\boxed{\small{\bf{\therefore The\: speed\: a\: car\: in\: m/sec\: is\: 15\: m/sec\: .}}}}}$