Jerry needs to reach his school, which is at a distance of 3 km from his home, in 30 minutes. He stops on the way to buy a textbook, which takes 6 min. At what speed (in km/h) should he walk to reach the school on time? (Speed = Distance $\div$ Time)
7.5

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Solution

The correct option is A 7.5
Let the required speed of Jerry be x km/h.

Time left to reach school after buying the book
= 30 - 6
= 24 min
= 24/60 h
= 0.4 h

Speed (x km/h)
= Distance $\div$ Time
= 3 km $\div$ 0.4 h
= 7.5 km/h

Therefore, x = 7.5

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Jerry needs to reach his school, which is at a distance of 3 km from his home, in 30 minutes. He stops on the way to buy a textbook, which takes 6 min. At what speed (in km/h) should he walk to reach the school on time? (Speed = Distance ÷ Time)7.5

The correct option is A 7.5Let the required speed of Jerry be x km/h. Time left to reach school after buying the book = 30 - 6 = 24 min = 24/60 h = 0.4 h Speed (x km/h) = Distance ÷ Time = 3 km ÷ 0.4 h = 7.5 km/h Therefore, x = 7.5

Jerry needs to reach his school, which is at a distance of 3 km from his home, in 30 minutes. He stops on the way to buy a textbook, which takes 6 min. At what speed (in km/h) should he walk to reach the school on time? (Speed = Distance $\div$ Time)
7.5

The correct option is A 7.5
Let the required speed of Jerry be x km/h.

Time left to reach school after buying the book
= 30 - 6
= 24 min
= 24/60 h
= 0.4 h

Speed (x km/h)
= Distance $\div$ Time
= 3 km $\div$ 0.4 h
= 7.5 km/h

Therefore, x = 7.5