Answer:
\[{{t}_{1}}=\frac{d}{v},{{t}_{2}}=\frac{d}{{{v}_{1}}}\]where\[{{V}_{1}}=0.8v\,\,{{t}_{3}}=\frac{d}{{{v}_{2}}}\] where \[{{V}_{2}}=0.8{{V}_{1}}\]
\[{{t}_{4}}=\frac{d}{{{v}_{3}}}\]where\[{{v}_{3}}=0.8{{v}_{2}},\] we get the required by answer by subtracting\[{{t}_{3}}\]from\[{{t}_{4}}.\]
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