Explanation

Average speed ≠ average of speeds when distances are equal.  

Use: Average speed = Total distance / Total time

Total distance = 60 + 60 = 120 km

Time for 1st part = 60 km / 60 km/h = 1 hour  

Time for 2nd part = 60 km / 120 km/h = 0.5 hour  

Total time = 1 + 0.5 = 1.5 hours

Average speed = 120 / 1.5 = 80 km/h.

Last verified on 13-06-2026

Explanation

Formula: Distance = Speed × Time

= 60 × 3

= 180 km

Last verified on 11-06-2026

Explanation

Time for first part = 60 ÷ 40 = 1.5 h

Time for return = 60 ÷ 60 = 1 h

Total distance = 120 km

Total time = 2.5 h

Average speed = 120 ÷ 2.5 = 48 km/h

Last verified on 13-05-2026

Explanation

This is a distance problem using the Pythagorean theorem.

A person moves:

• 80 km North
• 60 km West

These form a right triangle.

Distance from starting point:

d=  √(80^2 + 60^2)

=√(6400 + 3600)

= √(10000) 

= 100 km

Last updated question by NS on 2 MAY 2026

Explanation

Step 1: Convert time into hours

1 hour 30 minutes = $1.5$ hours

Step 2: Use the formula

Speed=Distance/Time​

Step 3: Calculate

Speed=60/1.5​=40 km/h

Last updated by NA on 23-April-2026