Question

a bus travels 126 km in 3 hours and a train travels 315 km in 5 hours, then the ratio of
speeds is
(a) 2:5
(b) 2:3
(c) 5:2
(d) 25:6​

Answer 1

Answer:

b)2:3

your answer....

Answer 2

$\underline {\boxed {\bold {Question}}}$

• A bus travels 126 km in 3 hours and a train travels 315 km in 5 hours, then the ratio of  speeds is ?

$\underline {\boxed {\bold {Important \: concepts \: to \: be \: learned}}}$

• In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position; it is thus a scalar quantity.
• SI unit: m/s, m s−1
• Dimension: L T−1

$\underline {\boxed {\bold {Important \: formulas \: to \: be \: learned}}}$

• $\boxed{Speed = \frac{Distance \: covered}{Total \: time \: taken} }$

$\underline {\boxed {\bold {Answer}}}$

• For Bus ,

Distance traveled = 126 km

Time taken = 3 hours

∴ Speed of bus = 42 km/hr

• For train ,

Distance travelled = 315 km

Time taken = 5 hours

∴ Speed of train = 63 km/hr

∴ Ratio of their speed = 42 : 63

                                     = 7 × 6 : 9 × 7

                                     = 6 : 9

                                     = 2 : 3

$\underline {\boxed {\bold {\therefore Ratio \: of \: their \: speeds \: = 2 : 3}}}$

Hope this helps u..../