Question

A train crosses a bridge 100 m long in 45 seconds at a speed of 60 km/hFind the time taken by the train to cross a clock tower.​

Answer 1

$\large \sf \green {\boxed {Time\: =\: Distance/Speed}}$$\large \sf \purple {Total\: distance \:to \: be \:travelled\: =\:450\:m}$$\large \sf \purple {Distance \: = \: speed \times time}$

$= 100 \times 45 = 450m$

$\large \sf \purple {Converting\: it \:into\: km}$

$450 \div 1000 = 0.45km$

$time = distance \div speed = 0.45 \div 60 = 0.3 \div 4$

$\large \sf \green {\boxed {Time\: = \:3/40\: hour}}$

${\boxed{(3 \div 40) \times 60 \: min = 4.5 \: min}}$