Question

 speed of a train is 90 km/hr . It is increased by 10 % . Find the new speed of the train.​

Answer 1

GIVEN :-

• The speed of a train = 90 km/hr.

• It is increased by 10%.

TO FIND :-

• New Speed of the train.

SOLUTION :-

New Speed of Train = 90 + 10% of 90.

➠ 10 × 90/100 = 9.

Now,

➠ New Speed of train = 90 + 9.

➠ New Speed of train = 99 km/hr.

Therefore, New Speed of train = 99 km/hr.

EXTRA INFORMATION :-

(1) 3 equations of motions :-

• v = u + at.

• s = ut + ½ at²

• v² = u² + 2as.

(2) Speed :-

• It is the magnitude of the change of its position.

• It is a scalar quantity.

Answer 2

Given

Speed of a train is 90 km/hr, now It is increased by 10 % .

We Find

New speed of the train

According to the question

New Speed of Train = $\sf\frac{10 × 90}{100}$

New Speed of Train = $\sf\frac{900}{100}$

New Speed of Train = $\sf\cancel\frac{900}{100}$

New Speed of Train = 9 km

So, Speed of train increase by 9 km

Hence, We Find Total speed of Train :-

New Speed of Train = 90 + 9 km

New Speed of Train = 99 km/hrs

Hence, New Speed of Train is 99 km per hour.