Question

A girl has to cover a distance of 400 km in 5 hours. He traveled for some time at a speed of 85 km / hr and the remaining time at a speed of 55 km / hr. How long did he travel at high speed? (A) 4 hours 10 minutes (B) 4 hours 25 minutes. (C) 4 hours 15 minutes (D) 4 hours 35 minutes

Answer 1

Answer:

4 hours 25 minutes

Step-by-step explanation:

let,

in 1 hours she travels 85 km

in 1 hours she travels 55 km

in 2 hours she travels 140 km

so in leftover km(400-140)=260km

in 400 km travels 5 hour

in 1 km travels 5÷400 hour

in 260 km travels (0.0125×260) hour

= 3 hours 25 min

total travels in highest speed ( 3.25 hours +1 hours)

= 4 hours 25 min