120. Rib-band.

121. 400 ÷ 16 = 25. √25 = 5—five seconds.

122. Because they have arms and legs.

123.

{√(602 - 302) = 51.96152
√(602 - 402) = 44.72136
}

96.68288. Ans.

124. 1,785.

125.

’Tis good to tread the churchyard’s walks,