Disha Expert Team Solutions for Exercise 1: EXERCISE

The speed of a boat when travelling downstream is$32$ $kmph$ whereas when travelling upstream it is$28$ $kmph$. What is the speed of the boat in still water?

A man covers a certain distance on a scooter. If the scooter moved $4 \mathrm{km}/\mathrm{h}$ faster, it would take $30$ minutes less. If it moved $2 \mathrm{km}/\mathrm{h}$ slower, it would have taken $20$ minutes more. Find the distance covered by scooter.

A boat running downstream covers a distance of $16$ $km$ in $2$hours while for covering the same distance upstream, it takes $4$hours. What is the speed of the boat in still water?

R and S start walking towards each other at $10$ AM at the speeds of $3 \mathrm{km}/\mathrm{h}$ and $4 \mathrm{km}/\mathrm{h}$ respectively. They were initially $17.5 \mathrm{km}$ apart. At what time do they meet?

In a $800 \mathrm{m}$ race around a stadium having the circumference of $200 \mathrm{m}$, the top runner meets the last runner on the $5\mathrm{th}$ minute of the race. If the top runner runs at twice the speed of the last runner, what is the time taken by the top runner to finish the race?

A long distance runner runs $9$ laps of a $400$ metres track everyday. His timings (in minutes) for four consecutive days are $88, 96, 89$and$87$respectively. On an average, how many metres/minute does the runner cover?

Mohan travels $760 km$ to his home, partly by train and partly by car. He takes $8$ hours if he travels $160 km$ by train and the rest by car. He takes $12$ minutes more if he travels $240 km$ by train and the rest by car. The speed of the train and the car respectively are:

A boy rows a boat against a stream flowing at $2$ kmph for a distance of $9 km$, and then turns round and rows back with the current. If the whole trip occupies $6$ hours, find the boy's rowing speed in still water?