Question

The speed of a motor boat is 20 km/hrs. A) how far would the motor boat go in three and a half hours ? B) how much time will they take to go 85 km First answer will be marked as brainliest

Answer 1

Given

• The speed of a motor boat is 20 km/hrs.

Find out

• how far would the motor boat go in three and a half hours ?
• how much time will they take to go 85 km?

Solution

★In first case

• Speed of motor boat = 20km/hrs
• Time taken = 3 ½ hrs = 7/2 hrs
• Distance travelled = ?

→ Distance = speed × time

→ Distance = 20 × 7/2

→ Distance = 10 × 7

→ Distance = 70km

Hence, it will travel 70km in 3 ½hrs

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★ In second case

• Speed of motor boat = 20km/hrs
• Distance travelled = 85km
• Time taken = ?

→ Time = distance/speed

→ Time = 85/20

→ Time = 17/4

→ Time = 4 ¼ hrs

Hence, they will take 4 ¼ hrs to go 85km

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Answer 2

Given:

• The speed of motor boat = 20km/h

To find:

1. a) Distance travelled in 3 1/2 hrs
2. b) Time taken to travell 85 km

Solution:

a) sol:

Given,

• Speed = 20km/h
• time = 3.5 = 7/2 hrs

Using

Speed = Distance/time

Simplifying

★ Distance = speed × time

→ Distance = 20 × 7/2

→ Distance = 10 × 7

→ Distance = 70km

Hence , the motor boat will travell 70km in 3 ½ hours.

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Given

• Speed = 20km/h
• Distance = 85 km

Using

Speed = distance/time

Simplifying

★ Time = Distance/Speed

♦ Time = 85/20

♦ Time = 4.25 hrs

Hence , the motor boat takes time 4.25hrs to travell 85 km