7. A car covers a distance of 33 km in 72 minutes.
Find the speed during the last 18 km if the first
15 kilometres are covered at 25 km/h.
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Solution :-
Provided :-
• Total time = 72 min
• Total distance = 33 km
• 15 km with speed = 25 km/h
Now 15 is covered in
→ 15 = 25 x
→ 3/5 = x
or x = 3/5 × 60
= 36 min
Therefore remaining time = 36 min
Now to travel 18 km in 36 min or 3/5 hrs
→ d/t = v
→ 18 ÷ 3/5 = v
→ 30 km /h = v
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