Question

Out of a total distance covered of $200$ km, first half is covered at the speed of $60$ km / hr and the remaining half is covered at $75$ km/hr . Find the total time taken to cover the whole journey.

• A. $3$ hours
• B. $2$ hour
• C. $1$ hours
• D. $4$ hours

Answer 1

The correct option is A $3$ hours

Time taken to cover first 100 Km at 60km/h $=\frac{100}{60}=\frac{5}{3}$
Time taken to cover last 100 Km at 75km/h $=\frac{100}{75}=\frac{4}{3}$
Total time taken to cover 200 Km $=\frac{5}{3}+\frac{4}{3}=\frac{9}{3}=3$hrs