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Primary school mathematics cycle
Thought of equality:

Solution: (1) Let the circular runway be x meters.

x =(3+4)×45

=7×45

=3 15

(2) Suppose Xiaomi and Tang Xiao meet again after one second, then

(4-3)x=3 15

x=3 15

Answer: (1) Circular runway 315m.

(2) If we go in the same direction, Xiaomi and Tang Xiao will meet again in 3 15 seconds.

Arithmetic thinking:

( 1)(3+4)×45 = 7×45 = 3 15(m)

(2) 315 ÷ (4-3) = 315 ÷1= 315 (seconds)

Answer: (1) Circular runway 315m.

(2) If we go in the same direction, Xiaomi and Tang Xiao will meet again in 3 15 seconds.